Any Trouble if I use large themes?

The theme itself is not 90MB, they probably included all of the Photoshop files (design) as well. No theme will be 90MB ??

I was curious about a 90MB theme, so I downloaded the danoska theme, and sure enough: the zip file is 90MB, but when you unpack it, it includes something like 200MB worth of PSD files for 10 different color variations. The theme directly itself is quite small.

This is actually good thing, the author of the theme was kind enough to provide us with the entire source. Not many free theme authors will do that nowadays. I think that’s kind of neat.

If this was me, I would note the download that the theme includes PSD too, just to prevent people from not downloading something that’s almost 100MB.