Good advice so far. I wonder about one other possibility.

The post says "coming back to use this software" and you are now using version 2020. Does that mean you updated from a version before version 2018?

If so, in 2018, substantial changes were made to the folder structure of BIAB. If the program is not finding something, I wonder if it would help to run the Cleanup utility? It cannot hurt to try doing so.

Try Help, Utilities, Run Cleanup Routine.
Also, then do this:

File, File Utilities, Associate File Types


BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.