asiaexpat wrote:when i dont even have a phpbb_seo/phpbb_seo_class.php,
That file is part of the 0.2.2 download. It may be easier for you to first remove all traces of the prior versions and reinstall on a test server. It is needlessly confusing to merge the newer refactored version with the beta version when they're not that big in the first place.
While I'm doling out unsolicited advice, I recommend double-checking your work. I use
beyond compare to spot check all my site's mods. For example, I'll compare against the "virgin" phpBB release when migrating to a new phpBB version. Although I use ezMOD, I've managed to miss a line or two over the years. The same strategy works even better for smaller fixes. If you backup your board to a local install before starting you can double check your work afterward to confirm the changes called out in the MOD instructions were indeed followed. In 99.8% of the cases, the troubles reported on forums with mod installations are attributed to incorrect application of the mod's instructions, not a coding error (ezMOD is a godsend in this respect).
dcz has thoughtfully tagged all changes with BEGIN / END comments, but that doesn't mean you didn't miss a change. The above suggestions apply to any modifications, not just phpbb-seo's, and are the stock and trade of any professional programmer. Since the mods we're discussing have farther reaching consequences that
Joe Bob's favorite phbBB tweak, it behooves you to get it right the first time.