If I remember correctly I downloaded System 7 with my PC as well and then put it onto my first Mac without problems.
For the beginning MacOS 7.5.3 is fine for a 5400 although I personally like 9.1 over it just because you can use iTunes 2 on it.
You'd have to buy that unfortunately.
I heard Linux is not easily installed on those old-world PowerMacs. In fact you can't just drop your cd in and wait for installation, you will have to make installation floppies instead to be able to properly read your Linux cd.
Greetings, Jens
Interested in: Atari 16/32 and Clones - Macintosh - Sun - Amiga 1200
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