The latest version of CacheCDFS is 42.19.
Using OS 3.9+BB2 here.
You can copy it directly from the OS 3.9 CD, it's not updated in any of the Boing Bags.
AmigaOS3.9:OS-Version3.9/CacheCDFS/L/CacheCDFS
Backup your old version in case the new one is somehow not compatible with something.
