I can't update Disciples II

[khalox]

I can't update Disciples II - Dark prophecies.
According to the version information it's "Disciples II v1.1" (US english). I've downloaded the update v1.1 to 1.2a (and so on) from the official web site and it says it's not the proper version.
(Also the other updates...)

The main EXE file on the ORIGINAL CD (it's a bundled copy from a magazine) is 4 286 976 bytes.
I suspect that it is not the original retail game v1.1 EXE so I need an original v1.1 EXE (please send me via e-mail)... or any other solution?