The versions should be the same (other than however the different companies package them). At least with the CD/DVD version, the game displays the version number as 1.0034A, which is often shortened to 1.34. If the remastered version lists the version as 1.004A, perhaps Impulse just shortened that a bit, or it could be that 1.04 is the actual version number, and people are still shortening it to 1.4.
They list the minimum requirements as XP, but don't mention one way or another if Vista or Win 7 are compatible or not. The original release works fine in Vista/7, as does GOG's remastered version, so I can't see Impulse doing anything that would break that.
I used quicksaves when just exploring or clearing areas, but kept unique named saves before/after quests/battles, entering new buildings/areas, etc, so I had the option to reload and try solving a quest a different way, or to make sure I cleared an area before triggering certain cutscenes, etc (in one case defeating a particular boss monster would destroy any remaining opponents in that building, so you would miss out on some experience points if went too far north without clearing the rest).
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