This version primarily targets two security flaws that were identified in earlier builds:
While it does not introduce new creative instruments or loops like previous versions (such as the 10.4.1 or 10.4 releases), it is highly recommended for all users to ensure the stability and safety of their music projects. Key Security Fixes in Version 10.4.8
Once installed, go to GarageBand > About GarageBand in the top menu bar to confirm you are running version 10.4.8. Why Users Consider This "Better"