Re: [bogus] Installation of 4.0 beta: Show stopper at line 45 of tiki-install.php
Adreas, see this post for a workaround if your server doesn't have "pdo":
http://tikiwiki.org/tiki-view_forum_thread.php?comments_parentId=35277&topics_offset=10&topics_sort_mode=lastPost_desc&forumId=6
in case it works for you (it didn't for me, but maybe for another reason)