Flexicapture isn’t even working on my machine with the latest Studio CE Version.
I got the same error and therefore tried to register the following two DLLs myself from some experience from the old days.
C:\Windows\SysWOW64>regsvr32 "C:\<your-path-here>\.nuget\packages\uipath.abbyy.activities\1.2.0\lib\net461\UiPath.Abbyy.Activities.dll" C:\Windows\SysWOW64>regsvr32 "C:\<your-path-here>\.nuget\packages\uipath.abbyy.activities\1.2.0\lib\net461\UiPath.Abbyy.Activities.Design.dll"
I got the following errors in both cases. I tried both, the 32 bit and 64 bit versions of REGSVR32.
Hope this provides a clue to fixing this issue.