Re/Installing an MSI, getting 'not a valid short file name' error
Solution 1:
You could try opening the .msi in Orca or other .msi packager/editor and look at the 'Shortcut and File table' to verify the ShortName and LongName entries are correct and valid. The ShortName needs to be a valid 8.3 filename.
For example
IMPORT~1.DLL