Sometimes, after a driver update, your CATIA license is no longer available, due to an incorrect target-ID.
Running the tool i4target.exe from the LUM directory results in the error 'Unable to obtain win32mac'.
The reason for this error is an incorrect registry entry.
If you delete the key 'I4DRIVER' under HKEY_LOCAL_MACHINE\SOFTWARE\IBM\LICENSE USE RUNTIME, i4target.exe will work again.