I didn't try the new rar folders, but I think this is fine, since zip is more commonly used anyway, as far as I know.
I appreciate your continued interest in my other packs!

Pit Lems and Paralems are older than Lemmicks, though, so the levels are of much lower quality.
Especially Paralems is really more of a collection of stupid references that aren't really challenging at all, and has a good deal of somewhat trolly levels.
Pit Lems was indeed designed to be more puzzle-focused and strictly fair. The levels don't have an overarching theme, though. The first version had quite a lot of backroutes (see nin10doadict's Let's Play), and some of the open-ended levels (X-of-everything ones) have so many degrees of freedom that they're quite easy.
I still consider the puzzles in Pit Lems good enough to be worthy of conversion to New Formats eventually, and I'll add some select levels from Paralems that I consider worthwhile to it as well, creating something I'm going to call Pit Lems Remastered in the process.
Pit Lems does have a lot of Radiation and Slowfreeze levels, though, including some that were nominated for Level of the Year, so it's definitely still worth giving a shot in Old Formats as well.

Paralems is really just more of a thing if you're interested in it for historic reasons. Since you said you already played GigaLems, which does contain some Troll elements as well, and you weren't as bothered by execution difficulty in Lemmicks as other players might have been, maybe you'll enjoy Paralems after all. But it would certainly be the
last one of my packs I recommend to anyone - because it was the very
first one I ever made.
Lemmings World Tour is my flagship pack, and most likely will remain that way even once I release Lemmings Open Air, Hall of Fame, and Drugs and Rock 'n Roll. Because those latter packs are going to be more difficult by nature.
Lemmings World Tour is, as far as I can tell, slightly easier than Lemmicks on average, while still having an overarching theme, fair puzzly-levels (unless they contain an octopus

), and offers lots of pretty landscape levels and custom self-recorded music to boot (you've already heard some of the tracks on the last levels of each rank while playing Lemmicks

).