For some reason it says the system policy stops it. This is incorrect. Log as attached:
[1478:16E0][2016-03-29T22:10:56]i001: Burn v3.8.1128.0, Windows v6.3 (Build 9600: Service Pack 0), path: C:\Users\layer3admin\AppData\Local\Package Cache\{65cd036b-4c9e-4f97-ade3-56865f5249ba}\MYOB AccountRight Setup 2015.4.exe, cmdline: '/uninstall'
[1478:16E0][2016-03-29T22:10:56]i000: Setting string variable 'WixBundleLog' to value 'C:\Users\LAYER3~1\AppData\Local\Temp\MYOB_AccountRight_2015.4_20160329221056.log'
[1478:16E0][2016-03-29T22:10:56]i052: Condition 'VersionNT >= v6.0' evaluates to true.
[1478:16E0][2016-03-29T22:10:56]i100: Detect begin, 10 packages
[1478:16E0][2016-03-29T22:10:56]i000: Setting string variable 'NETFRAMEWORK45' to value '378675'
[1478:16E0][2016-03-29T22:10:56]i052: Condition 'VersionNT64' evaluates to true.
[1478:16E0][2016-03-29T22:10:56]i000: Setting string variable 'SQLCE35X64VERSION' to value '3.5.8080.0'
[1478:16E0][2016-03-29T22:10:56]i000: Setting string variable 'SQLCE35X86VERSION' to value '3.5.8080.0'
[1478:16E0][2016-03-29T22:10:56]i052: Condition 'VersionNT64' evaluates to true.
[1478:16E0][2016-03-29T22:10:56]i000: Setting string variable 'SQLCE40X64VERSION' to value '4.0.8876.1'
[1478:16E0][2016-03-29T22:10:56]i052: Condition 'NOT VersionNT64' evaluates to false.
[1478:16E0][2016-03-29T22:10:56]i000: Setting string variable 'SYNCDBPROVIDERSINSTALLED' to value '1'
[1478:16E0][2016-03-29T22:10:56]i000: Setting string variable 'SYNCFX21INSTALLED' to value '1'
[1478:16E0][2016-03-29T22:10:56]i052: Condition 'NETFRAMEWORK45 >= 378389' evaluates to true.
[1478:16E0][2016-03-29T22:10:56]i052: Condition 'NOT VersionNT64 AND (SQLCE40X86VERSION >= v4.0.8876.1)' evaluates to false.
[1478:16E0][2016-03-29T22:10:56]i052: Condition 'VersionNT64 AND (SQLCE40X64VERSION >= v4.0.8876.1)' evaluates to true.
[1478:16E0][2016-03-29T22:10:56]i103: Detected related package: {7AC8EF88-D996-4D47-B40C-4DD93E307481}, scope: PerMachine, version: 2.1.1648.0, language: 0 operation: MajorUpgrade
[1478:16E0][2016-03-29T22:10:56]i103: Detected related package: {E0385086-61C1-4045-90A1-83048575E458}, scope: PerUser, version: 2.18.2675.0, language: 0 operation: Downgrade
[1478:16E0][2016-03-29T22:10:56]i101: Detected package: NetFx45Web, state: Present, cached: None
[1478:16E0][2016-03-29T22:10:56]i101: Detected package: Pkg_SqlCe35x86, state: Present, cached: None
[1478:16E0][2016-03-29T22:10:56]i101: Detected package: Pkg_SqlCe35x64, state: Present, cached: None
[1478:16E0][2016-03-29T22:10:56]i101: Detected package: Pkg_SqlCe40x86, state: Absent, cached: None
[1478:16E0][2016-03-29T22:10:56]i101: Detected package: Pkg_SqlCe40x64, state: Present, cached: None
[1478:16E0][2016-03-29T22:10:56]i101: Detected package: Pkg_SyncFx21, state: Present, cached: None
[1478:16E0][2016-03-29T22:10:56]i101: Detected package: Pkg_SyncFxDbProviders, state: Present, cached: None
[1478:16E0][2016-03-29T22:10:56]i101: Detected package: ARL.Client, state: Present, cached: Complete
[1478:16E0][2016-03-29T22:10:56]i101: Detected package: ARL.SampleFiles, state: Absent, cached: Complete
[1478:16E0][2016-03-29T22:10:56]i101: Detected package: ARL.API, state: Obsolete, cached: Complete
[1478:16E0][2016-03-29T22:10:56]i199: Detect complete, result: 0x0
[1478:16E0][2016-03-29T22:10:58]i200: Plan begin, 10 packages, action: Uninstall
[1478:16E0][2016-03-29T22:10:58]i000: Setting string variable 'WixBundleRollbackLog_ARL.Client' to value 'C:\Users\LAYER3~1\AppData\Local\Temp\MYOB_AccountRight_2015.4_20160329221056_0_ARL.Client_rollback.log'
[1478:16E0][2016-03-29T22:10:58]i000: Setting string variable 'WixBundleLog_ARL.Client' to value 'C:\Users\LAYER3~1\AppData\Local\Temp\MYOB_AccountRight_2015.4_20160329221056_0_ARL.Client.log'
[1478:16E0][2016-03-29T22:10:58]w322: Skipping cross-scope dependency registration on package: Pkg_SyncFxDbProviders, bundle scope: PerUser, package scope: PerMachine
[1478:16E0][2016-03-29T22:10:58]w322: Skipping cross-scope dependency registration on package: Pkg_SyncFx21, bundle scope: PerUser, package scope: PerMachine
[1478:16E0][2016-03-29T22:10:58]w321: Skipping dependency registration on package with no dependency providers: Pkg_SqlCe40x64
[1478:16E0][2016-03-29T22:10:58]w321: Skipping dependency registration on package with no dependency providers: Pkg_SqlCe40x86
[1478:16E0][2016-03-29T22:10:58]w322: Skipping cross-scope dependency registration on package: Pkg_SqlCe35x64, bundle scope: PerUser, package scope: PerMachine
[1478:16E0][2016-03-29T22:10:58]w322: Skipping cross-scope dependency registration on package: Pkg_SqlCe35x86, bundle scope: PerUser, package scope: PerMachine
[1478:16E0][2016-03-29T22:10:58]w321: Skipping dependency registration on package with no dependency providers: NetFx45Web
[1478:16E0][2016-03-29T22:10:58]i201: Planned package: ARL.API, state: Obsolete, default requested: None, ba requested: None, execute: None, rollback: None, cache: No, uncache: Yes, dependency: Unregister
[1478:16E0][2016-03-29T22:10:58]i201: Planned package: ARL.SampleFiles, state: Absent, default requested: Absent, ba requested: Absent, execute: None, rollback: None, cache: No, uncache: Yes, dependency: Unregister
[1478:16E0][2016-03-29T22:10:58]i201: Planned package: ARL.Client, state: Present, default requested: Absent, ba requested: Absent, execute: Uninstall, rollback: Install, cache: No, uncache: Yes, dependency: Unregister
[1478:16E0][2016-03-29T22:10:58]i201: Planned package: Pkg_SyncFxDbProviders, state: Present, default requested: None, ba requested: None, execute: None, rollback: None, cache: No, uncache: No, dependency: None
[1478:16E0][2016-03-29T22:10:58]i201: Planned package: Pkg_SyncFx21, state: Present, default requested: None, ba requested: None, execute: None, rollback: None, cache: No, uncache: No, dependency: None
[1478:16E0][2016-03-29T22:10:58]i201: Planned package: Pkg_SqlCe40x64, state: Present, default requested: None, ba requested: None, execute: None, rollback: None, cache: No, uncache: No, dependency: None
[1478:16E0][2016-03-29T22:10:58]i201: Planned package: Pkg_SqlCe40x86, state: Absent, default requested: None, ba requested: None, execute: None, rollback: None, cache: No, uncache: No, dependency: None
[1478:16E0][2016-03-29T22:10:58]i201: Planned package: Pkg_SqlCe35x64, state: Present, default requested: None, ba requested: None, execute: None, rollback: None, cache: No, uncache: No, dependency: None
[1478:16E0][2016-03-29T22:10:58]i201: Planned package: Pkg_SqlCe35x86, state: Present, default requested: None, ba requested: None, execute: None, rollback: None, cache: No, uncache: No, dependency: None
[1478:16E0][2016-03-29T22:10:58]i201: Planned package: NetFx45Web, state: Present, default requested: None, ba requested: None, execute: None, rollback: None, cache: No, uncache: No, dependency: None
[1478:16E0][2016-03-29T22:10:58]i299: Plan complete, result: 0x0
[1478:16E0][2016-03-29T22:10:58]i300: Apply begin
[1478:16E0][2016-03-29T22:10:58]i329: Removed package dependency provider: {68E2ECE8-DBCA-4E35-99F2-E77747CEC7A0}, package: ARL.API
[1478:16E0][2016-03-29T22:10:58]i329: Removed package dependency provider: {9FB259AD-F4DD-48D5-9024-2212DE37F249}, package: ARL.SampleFiles
[1478:16E0][2016-03-29T22:10:58]i326: Removed dependency: {65cd036b-4c9e-4f97-ade3-56865f5249ba} on package provider: {0DD17ED5-2F43-4A21-8B86-0DD72013968E}, package ARL.Client
[1478:16E0][2016-03-29T22:10:58]i329: Removed package dependency provider: {0DD17ED5-2F43-4A21-8B86-0DD72013968E}, package: ARL.Client
[1478:16E0][2016-03-29T22:10:58]i301: Applying execute package: ARL.Client, action: Uninstall, path: C:\Users\layer3admin\AppData\Local\Package Cache\{0DD17ED5-2F43-4A21-8B86-0DD72013968E}v15.4.17.6418\MYOB AccountRight Client 2015.4.msi, arguments: ' ARPSYSTEMCOMPONENT="1" MSIFASTINSTALL="7"'
[1478:16E0][2016-03-29T22:10:58]e000: Error 0x80070659: Failed to uninstall MSI package.
[1478:16E0][2016-03-29T22:10:58]e000: Error 0x80070659: Failed to configure per-user MSI package.
[1478:16E0][2016-03-29T22:10:58]i319: Applied execute package: ARL.Client, result: 0x80070659, restart: None
[1478:16E0][2016-03-29T22:10:58]e000: Error 0x80070659: Failed to execute MSI package.
[1478:16E0][2016-03-29T22:10:58]i318: Skipped rollback of package: ARL.Client, action: Install, already: Present
[1478:16E0][2016-03-29T22:10:58]i319: Applied rollback package: ARL.Client, result: 0x0, restart: None
[1478:16E0][2016-03-29T22:10:58]i323: Registering package dependency provider: {0DD17ED5-2F43-4A21-8B86-0DD72013968E}, version: 15.4.17.6418, package: ARL.Client
[1478:16E0][2016-03-29T22:10:58]i325: Registering dependency: {65cd036b-4c9e-4f97-ade3-56865f5249ba} on package provider: {0DD17ED5-2F43-4A21-8B86-0DD72013968E}, package: ARL.Client
[1478:16E0][2016-03-29T22:10:58]i399: Apply complete, result: 0x80070659, restart: None, ba requested restart: No