Hey! I took a dive into the FlexTight scanners late last year and actually got my FlexTight Precision II to work on 64-bit Windows 11:
https://pathar.tl/resources/flextight
https://pathar.tl/resources/flexcolor
Through various driver discs and archived files online I was able to compile some resources and threw them up on Archive.org (available on the FlexColor page of my site).
Let me know if you have any questions!