There's only two versions I know of, the Fairlight version which has a very serious bug on the egyptian level where you simply cannot move at all.
The other version is by Ministry and there's apparently a problem in the london level where a certain event never happens making it impossible to continue.
There's a thread about it somewhere on here, the only way it was completable was by playing one version, saving the game and then carry on playing it with the other version.
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