Thanks for the extra information.

When you update BIAB, do you use the Update Manager (Under "Help") or do you download the updates and install them manually?

Build 840 is the latest build for BIAB 2021.

What I'd try is....

1. download update #840 manually from the link below.

https://www.pgmusic.com/support_windowsupdates.htm

2. plug in the BIAB 2021 USB drive (but do not start BIAB)

3. doubleclick on the downloaded update file (this can be on your main computer).

4. when the update installation gets to the part where it lists the paths for BIAB, make sure you enter the paths for the USB drive.

For example, if your USB drive is W then you'd have

BIAB in... W:\bb

Realtracks in... W:\bb\Realtracks

Realdrums in ... W:\bb\Drums


The update could take a few minutes to install.

Once the updating is done, see if you can start BIAB 2021 from the USB drive.

Regards,
Noel

MY SONGS...
Audiophile BIAB 2025