I literally tried every thing I could find from existing issues and nothing worked. I finally came across another piece of software having the same issue and tried their solution and it worked.
I copied (don't move!) from C:\Windows\SysWOW64:
mscvp100.dll
msvcr100.dll
msvcr100_clr0400.dll
xinput1_3.dll
and from C:\Windows\System32
mfc100.dll
mfc100u.dll
^^ Again copy those don't move them or you will break other things!
to the base Spriter directory (C:\Program Files(x86)\Steam\steamapps\common\Spriter\) and it now works. I don't know if all 6 of those are needed (maybe Edgar can offer insight as to what DLLs are used by Spriter?) as I was copying a solution for different software that uses similar DLLs, but its less than a MB each and I am not going to tempt fate with a trail and error lol. The website suggested downloading them from here:
https://mega.nz/file/KN53zKBK#CVEEkEOTIFOO1-IoNnZCua5eq6Xzbb9i0cTWZA0WU3Q
I did download that and it's a legit pack of DLLs both x86 and x64 version and they scanned clean, but I already had those so I chose to copy them from my Windows directory instead, just want to post as complete a solution as possible for anyone else that stumbles across this!