I cant' install Mozilla 1.1 by RPMs on top of Mozilla 1.1b, even if I disinstall it. It seems that Mozilla 1.1b files are newer than Mozilla 1.1, that is strange as 1.1b should be a beta version
The current version of the nightlies is still marked 1.1b, but it's really a 1.1+ or 1.2a or whatever you might call it.
I would have to change the serial numbers to do that, and I don't really want to. Just install the old ones first or use --oldpackage. I figure if you're getting beta rpms and upgrading around them, you know what you're doing. :)