i got CXL Platinum too from the humble bundle because i thought "hey why the hell not, it's $1 and maybe it improved since the original first version!" i bought the first cities xl back when it was still owned and run by the original studios (monte cristo i think), and back when they attempted a really stuffty massive world wide city trade market that cost monthly. the first CXL was incredibly plagued with memory leaks, and lack of multi core capability, so running the game was very hard to do even with an incredibly robust system. the game was just horribly developed but sold with its pretty images of detailed terrain and ~~CURVED ROADS!!!~~, but even if it did run well gameplay was horrible and consisted of having to constantly keep going and going and expanding and expanding, otherwise your profit would plummet eventually. not to mention bugs and UI was horrible aside from the serious memory leak issues.
so i installed Platinum to see if anything changed. lo and behold, nothing changed. literally, nothing is different from cities xl 1 as far as i can tell. same stuffty menus, same god awful performance problems, same everything. glad i didn't pay more than $1 for this garbage.