My tileset was lost!!! (and another problem)

I accidentally deleted ZC! I was deleting uncessary folders at the time so I didn't realize it. Then.....sigh....I deleted the Recycle Bin.....I redownloaded ZC 1.90 and when it opens it just has the blue setup screen and the installing part won't come up. I red/led it 3 times already andit does the same thing. HELP! (BTW, where can I get the latest ZC public beta that is compatible w/ ZQuest?)

Here is version 1.92 beta 104, I think it's the newest public version with Zquest.

Thanx VEL, I still need to figure out how to get 1.90 to install tho...