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Errors in Studio 2019: 'unable to find assembly 1SDL.LanguagePlatform.FineGrainedAlignment...'; 'Failed to activate the TMs view'

Dear friends, 

1) got an error a few days ago when trying to open Studio: 'Unable to find assembly 'SDL.LanguagePlatform.FineGrainedAlignment, Version=1.0.0.0, Culture=neutral, PublickeyToken=c28cdb26c445c888'

2) renamed as ...15.0.0.0_OLD (in Roaming)(without deleting the 15.0.0.0)

3) managed to open Studio again, happy for solving the problem thanks to your suggestions

but now

4) when clicking the TMs tab got a new error 'Failed to activate the TMs view'

5) renamed TranslationMemoryRepository.xlm by adding _OLD at the end

6) didn't work: in fact, when trying to re-open Studio I get once again the error as in 1)

Can anyone help? I bought Studio in December, quite discouraged now… should I unistall and re-install the software?

Thank you!