The imp Rashax only gives you a key to open the door to the cook's supply room. To get to Samuel's lair, head south of the kitchen / storage room, then to the far east. There is a locked door on the way there, opened by a lever a little to the south.
When the game is patched from 1.47 to 1.49, the game version can still be shown as 1.47 on the main menu (it gets displayed correctly installing over an earlier version). This is just a cosmetic issue, though; if the game starts without the Play CD in an optical drive, then the patch installed correctly.
There were no changes to the game itself in the 1.49 patch, so no changes in the save file format or version.
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