Sometimes my skin says it doesn't have everything it needs so it downloads things, thats fine, but it keeps saying it needs this "rainlendar" thing and tries to download it but can't.

Rainlendar comes with multiple DLLs (plugins) that support other functions, so you need to tell netloadmodule which DLL to use in the zip file - assuming that the correct zip file has been downloaded in the first place. The netloadmodule line in the theme should have something like this:

*netloadmodule rainlendar-0.21 load rainlendar.dll

Man I'm a real technotwat, and I'm not sure what to do about it. Can you give me anymore help?

What version of rainlendar is the theme trying to load? There ought to be a line in the .rc files somewhere that looks like the one above, or at least this part:

*netloadmodule rainlendar