My site's been chugging along on mysql 4.0.27 for years. Finally realized that, yeah, maybe it was time to upgrade. Except the upgrade path from 4.0 to 5.X is to first upgrade to the 4.1 RPMs.
Except, of course, MySQL has taken those down as they're past supporting them.
Does it make any sense, are there any potholes, if I just take my site down to maintenance mode, remove the 4.0.X off my server and then install 5.X fresh, pointing it to the data files? Or doing a mysqldump first, then importing into the 5.X?