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http://www.ttlg.com/forums/showthread.php?t=121449

Go here for the latest, but DO NOT replace the patched EXE! Now you can edit the screen resolution without any errors.
http://www.ttlg.com/forums/showthread.php?t=121449&p=2090770&viewfull=1#post2090770

1.5.12 is the latest version.
Thank you voodoo47. This will ensure an optimal Thief experience.