I tried both methods. Initially I did it with the installer, and the path was correct (I'm not new to computers) exactly where you circled... it points to my external USB that I have been using for the last 2 years. When that didn't work, I tried installing it all manually and pointed the three new audio packs to the USB. That still didn't work for me.

You can see in my initial picture, the RealDrums and RealPack are in the same Band-In-A-Box location on the USB, but their own directories. That is where the files are located, and it detects the 4,000 odd Realtracks, I can see them there, and they were all working fine yesterday on the 2024 BIAB program. Only stopped being recognised when I installed 2025.

The directories are the same when you look at them in the confirm REaltrack/Drum folders, the picture I took, and the option screen you have included. I only did mine as it is simpler with one photo, but also shows that it does detect the realtracks there in that screen, where as in yours it doesn't have that information. I figured that was handy to see and know, since initially BIAB detects that the realtracks are there, but when I do a build it doesn't seem to find them.

Thats why I thought maybe it is actually a BIAB error in some way, rather than anything else. I'll try and revert back to 2023 and 2024, and see if it finds the files, then maybe upgrade to 2025 rather than install fresh and see what happens. But i'm pretty sure when I went from 2023 to 2024 I did the same thing and did a fresh install.