I'd been trying to find
this page for you and finally came across it again today. I *think* this is where I downloaded Studio 16 3.01 many years ago, although the links are long dead now. I thought it might have had 3.01A, but there are still a few interesting things:
1. The page suggests that 3.01 is the one with the multi-card bugfix.
2. The FAQ linked from that page says 3.01A is the one with the multi-card bugfix.
So, the first page could simply be wrong, but I suppose another possibility is that 3.01A was actually a sneaky sort of "second release" of 3.01 immediately after the first but none of the internal version numbers were changed. In other words, maybe the 3.01 circulating now
is 3.01A but not labeled as such? (Incidentally, the disks I think I made from that site match the versions that can be found today.)