Major music retailers sometimes offer physical hard drives or digital download codes for BIAB RealTracks sets, especially for large libraries like the (uncompressed WAV files).
Ensure you install them into your main BB or Applications/Band-in-a-Box folder. band in a box realtracks sets download
PG Music offers a free "RealTracks Demo Set" on their website. It includes 5 full RealTracks (e.g., Acoustic Bass, Electric Piano, Drums) that work with any version of BIAB. This is a safe way to test the download process. Major music retailers sometimes offer physical hard drives