WinTab32.dll is a library/DLL/API used to communicate with your
stylus/tablet (Wacom, etc.). Sometimes, when we load this DLL the
program just hangs or doesn't work properly. We don't know why this
happen, but there are few users experimenting this (maybe a buggy
WinTab32.dll, or maybe a buggy Aseprite).
Sometimes the problem is solved reinstalling the driver, sometimes the problem persists. As a first attempt, if you can execute Aseprite correctly, you can disable the driver going to Edit > Preferences > Experimental:
If you cannot even start the program, you can execute Aseprite with
--disable-wintab parameter (available since Aseprite v1.2):
"C:\Program Files\Aseprite\Aseprite.exe" --disable-wintab
This will bypass the
WinTab32.dll loading process. Your stylus might
not work correctly, but at least Aseprite can be executed and used
with your mouse/trackpad.