Yes, I can run Process Monitor. I filtered out the process "DopusInstall.exe" and I got a list of close to 22000 events just from the last click on "Next" in the installer until installation abort. I'm not sure what I'm looking for. Most lines has "Success" as result. If I filter away the events with Success i get about 1700 lines with another result and out of these I can find 16 events where the result is "FILE LOCKED WITH ONLY READERS". The list below is in order of event were the first line happend first.
C:\Windows\SysWOW64\ExplorerFrame.dll
C:\Windows\SysWOW64\edputil.dll
C:\Users\xxxxx\Downloads\DOpusInstall.exe
C:\Windows\SysWOW64\linkinfo.dll
C:\Windows\SysWOW64\ntshrui.dll
C:\Windows\SysWOW64\srvcli.dll
C:\Windows\SysWOW64\cscapi.dll
C:\Program Files (x86)\GPSoftware\Directory Opus\dopushlp.dll
C:\Users\xxxxx\AppData\Local\Temp\{E6DC4FEA-5BAA-47F9-803F-91F52AD210A8}\ISBEW64.exe
C:\Program Files (x86)\GPSoftware\Directory Opus\dopuslib32.dll
C:\Windows\SysWOW64\wtsapi32.dll
C:\Program Files (x86)\GPSoftware\Directory Opus\dopuslib.dll
C:\Users\admmilb\AppData\Local\Temp\{E6DC4FEA-5BAA-47F9-803F-91F52AD210A8}\ISBEW64.exe
C:\Program Files (x86)\GPSoftware\Directory Opus\dopushlp.dll
C:\Users\admmilb\AppData\Local\Temp\{E6DC4FEA-5BAA-47F9-803F-91F52AD210A8}\ISBEW64.exe
C:\Windows\SysWOW64\netutils.dll
These are the only errors I can find that is even close to killing the installer, but I might be looking at the wrong process or someting else. Most of the errors are "Name not found", "Reparse", "Is directory" and some "Buffer Overflow"