[Dream]

now I cant uninstall O_O

Database error in vBulletin 3.5.4:

Invalid SQL:
ALTER TABLE forum
	DROP `ucash_perthread`,
	DROP `ucash_perreply`,
	DROP `ucash_perview`,
	DROP `ucash_perdownload`;

MySQL Error  : Can't DROP 'ucash_perdownload'; check that column/key exists
Error Number : 1091

I will edit the database manually. I wish there was a way to clean up the hooks and products, maybe removing the product...

Maybe you should check for the existance of those columns before dropping them on the uninstaller, its a good programming habit, or any sql error stops everything.