The classic version will require at least datatypes library 45 and the later versions of some of the Reaction Classes so we are talking a 3.9 / 3.X version with RTG.
That's a little disappointing. For speed, meynaf's image viewer V (check EAB) is probably the best available. Supports all the common image formats, is fast, renders in HAM8 in good quality and requires AOS3.0. Needs 68020+.