Error 1722 when trying to install Adobe Flash Player ActiveX MSI - Server 2012 R2

I'm trying to install Flash Player on a computer, but it fails again and again. This is not a problem with the new installer; previous ActiveX versions doesn't work either. I have tried both online and offline installer. NPAPI and PPAPI works fine.

The computer that fails is a virtual Windows Server 2012 R2 used for terminal services.

The offline installer gives the following error: "Error 1722. There is a problem with this Windows Installer package. A program run as part of the setup did not finish as expected. Contact your support personnel or package vendor. Action NewCustomAction1, location: ...\InstallAX_24_0_0_..."

The online installer gives the following error at approximately the same time during the installation phase: "Failed to register"

I have tried the Adobe uninstaller and all the manual steps beneath it: Uninstall Flash Player for Windows

I have tried msizap on all GUID's listed here, from most recent and back to 18.0.0.160: MSI GUID list for Flash Player​

I have tried to reset the registry permissions here (I am aware of the OS descrepency): Troubleshoot Flash Player install issues related to Windows registry permissions

I also manually removed the keys HKEY_LOCAL_MACHINE\SOFTWARE\Macromedia and HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Macromedia (which only contained Flash entries) to no avail.

MSI log: https://justpaste.it/12j0h

C:\Windows\System32\Macromed\Flash\FlashInstall.log

=O====== M/24.0.0.194 2017-01-18+11-01-38.838 ======== 0000 00000042 0001 00001113 C:\Users\username\AppData\Roaming\Macromedia\Flash Player\www.macromedia.com\bin\* 3 0002 00000010 "C:\Windows\system32\Macromed\Temp\{E03840ED-7275-43AA-90B3-9051F5901072}\InstallFlashPlayer.exe" -install -skipARPEntry -iv 2 -au 4294967295 0003 00001036 Software\Macromedia\FlashPlayerActiveX/PlayerPath 2 0004 00001037 SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Adobe Flash Player ActiveX/ 2 0005 00001037 SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\\FlashUtil64_24_0_0_194_ActiveX.exe/ 2 0006 00000013 0007 00000015 C:\Windows\system32\Macromed\Flash\FlashUtil64_24_0_0_194_ActiveX.exe 0008 00000016 C:\Windows\system32\Macromed\Flash\FlashUtil64_24_0_0_194_ActiveX.dll 0009 00000023 C:\Windows\system32\Macromed\Flash\activex.vch 0010 00001032 C:\Windows\system32\Macromed\Flash\Flash64_24_0_0_194.ocx 0 0011 00000018 0012 00001032 C:\Windows\system32\Macromed\Flash\Flash64_24_0_0_194.ocx 0 =X====== M/24.0.0.194 2017-01-18+11-01-40.687 ========

C:\Windows\SysWOW64\Macromed\Flash\FlashInstall.log

=O====== M/24.0.0.194 2017-01-18+11-01-36.267 ======== 0000 00001113 C:\Users\username\AppData\Roaming\Macromedia\Flash Player\www.macromedia.com\bin\* 3 0001 00000010 "C:\Users\USERN~1\AppData\Local\Temp\{22AF9D99-A980-4071-A0BD-1D0BB956B9EA}\InstallAX_24_0_0_194.exe" -install -msi -prev 24.0.0.194 0002 00001036 Software\Macromedia\FlashPlayerActiveX/UninstallerPath 2 0003 00001036 Software\Macromedia\FlashPlayer\SafeVersions/24.0 2 0004 00001036 Software\Macromedia\FlashPlayerActiveX/UninstallerPath 2 0005 00000011 1 0006 00001037 SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\Adobe Flash Player ActiveX/ 2 0007 00001015 C:\Windows\SysWOW64\Macromed\Flash\Flash.ocx 5 0008 00000018 0009 00001045 C:\Windows\SysWOW64\Macromed\Flash\Flash.ocx 5 0010 00001015 C:\Windows\SysWOW64\Macromed\Flash\Flash.ocx 5 0011 00001037 SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\\FlashUtil32_24_0_0_194_ActiveX.exe/ 2 0012 00001015 C:\Windows\SysWOW64\Macromed\Flash\activex.vch 5 0013 00001045 C:\Windows\SysWOW64\Macromed\Flash\activex.vch 5 0014 00001015 C:\Windows\SysWOW64\Macromed\Flash\activex.vch 5 0015 00000013 0016 00000015 C:\Windows\SysWOW64\Macromed\Flash\FlashUtil32_24_0_0_194_ActiveX.exe 0017 00000016 C:\Windows\SysWOW64\Macromed\Flash\FlashUtil32_24_0_0_194_ActiveX.dll 0018 00000023 C:\Windows\SysWOW64\Macromed\Flash\activex.vch 0019 00001031 C:\Windows\SysWOW64\Macromed\Flash\activex.vch:5 =X====== M/24.0.0.194 2017-01-18+11-01-43.082 ========

[moderator: added 'MSI - Server 2012 R2' to title for clarity]