The patch checks the registry for the install path. If you installed the game from an account in Windows XP without administrative privileges, or used an over-aggressive registry cleaner, that could be the cause of the error.
You could run regedit (click Start | Run, type in 'regedit' and hit Enter) and check what is listed for the 'Version' under the key;
HKEY_LOCAL_MACHINE\Software\LarianStudios\BeyondDivinity
The North American / UK 1.45 English version patch I have is 22,294,413 bytes and has a CRC32 value of 9e4630a2. This is the cyclic redundancy check used in zip files, so if you have an archive manager that displays this under advanced properties, or something, you could zip the patch to check that it matches my version. Alternately, there are other programs to compute this value, such as
FileCheck. Usually corrupt program downloads give a different error, so I would check your registry first.
