I repeated same process on Win 7 by uninstalling BS, deleting the start program, deleting the BS folder. Then installing the above version. BS is now working again on my Windows 7 & quickly connecting fine.

I'm not sure will need to ask File_Girl, but I'm guessing she edited the original connection cache file, not replaced it. Otherwise I'd doubt BS would connect so easily.

I guess potentially you could set up a test account on your computer, install the above version to test it for yourself.

I don't think I ever tried BS 5.2. What are the differences you know?
I am aware BS 5.1 beta does not have UPnP support.

the only obvious difference between the Beta and 5.2, there is no chat and pro button,

also no ultrapeer option.