Hello Horváth Balázs 

Please try to install Studio 2015 manually: https://gateway.sdl.com/apex/communityknowledge?articleName=000001136

If it doesn`t work, try the solution from this article: https://gateway.sdl.com/apex/communityknowledge?articleName=000001400

Thank you,

Sorin

Hello Sorin, thanks for your answer!

However, two of the files among the files listed in the dependencies folder C:\ProgramData\Package Cache\SDL\Dependencies , which I had had to install according to your advice in order to fix the problem were related to the Office versions 2003 and  2007 

• o2003PIA.msi (depends on your Office version)
• o2007PIA.msi (depends on your Office version)

Since I have Office 365 on my computer, none of these files could I install and accordingly as I've tried to install Trados Studio 2015 I've failed again and got the same error message as before.

I could install manually all the other files mentioned in your help.

Could you tell me please how can I get a file version to install, which is compatible with my Office 365? It would be probably something like o365PIA.msi ?

Maybe it will solve my problem.

Thanks in advance!

Balázs