Can you open the source file in Word? Did you merge any segments in Studio?

Yes, I could open the source file without problems and have already translated around 40%. Then the error message appeared that it could no longer be found. I guess I have uploaded the wrong source file.

Not necessarily. You can open the source in Studio or in Word? It is important, that you can open the source in Word. If you can do so, but cannot open the translated Word, do a test:

Create a new project with the source Word, open it for translation, copy all source to target and save as Word. Can you open this Word file?

Not necessarily. You can open the source in Studio or in Word? It is important, that you can open the source in Word. If you can do so, but cannot open the translated Word, do a test:

Create a new project with the source Word, open it for translation, copy all source to target and save as Word. Can you open this Word file?

Jerzy - you are a genius!!! I created a complete new project for translation, opened it - and my translation so far war still in there. And I could open it in word as well. Thank you so much!!! Would you be available as my Trados trainer (of course against pay?). I often experience problems, and then I am completely lost. This is a serious request. Pls let me know. Uschi

Jerzy Czopik is fabulous and comes with oodles of experiences.  Thank you for your input which clearly is appreciated.
Uschi Mirwald keep this article in mind for future reference: https://gateway.rws.com/csm?id=kb_article_view&sysparm_article=KB0039149

PS: This post is a great example of community support and has made me smile.

Thank you both

Lyds

I definitely will Lydia :)