Hi, I would not be confident DFU version 3.45C has resolved APP loading issues with Windows 8.1 and 10 until this was tested carefully.
Wildcat 4.4 is the largest APP yet written for this platform and was not available for testing when DFU 3.45C was written. My understanding is it was written to address flakey copying of 2 and 3 slot applications and possibly allow Mac OS to copy files.
The 8MB volume supposedly needed at least SYS 1.64 to work with Mac OS but SYS 1.64 can cause other problems with crashing at launch.
Again I can only test what I have and I agree someone, probably SEEED? should sent Wildcat several units with 2.81 hardware and DFU 3.40C and on a second unit the latest shipping version.