I guess we now know what's wrong.
So the easiest way to update would most likely be to go for the 3.0.6 premod since you installed all the mods standalone. Would save the hassle to update all them, and only focus on the other mods.
To do this, if you don't have this many mods additionally installed, the simpler is to just re install them on the premod, and use the premod moded files (just make sure you do not overwrite config.php, .htaccess and files in phpbb_seo/cache/) before you hit install/database_update.php and gym_sitemaps/gym_install.php in update mode.
If you have many mods, a frontal merge would be my way, you could compare your files with the latest premod ones using for example winmerge, and just worry about keeping the other mods code in the new files.
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