in reply to ondrosik

Huh, I managed it
- Open heaviocity portal and don't change focus
- ocr nvda+r
- finally I see here the whole screen where is the library and that install button
- then choose location button
- Now I selected the folder using standard windows dialog
- clicked next unlabelled button
Now it is downloading, NVDA is reporting progress.
I should definitelly read #NVDASR manual again to understand how to OCR whole screen.