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Hey Malle, the plugin system changed a bit in Vanilla 2.5.
You're correct that the inaccessibility of the settings page is a symptom of the plugin not working anymore.
I'll put in a pull request with the necessary updates to let the plugin work for Vanilla 2.5.
I personally use XAMPP to run a local test forum on my computer.
Basically you install XAMPP (For example in C:/xampp, don't put it in C:/program files/xampp that will mess up file permissions), then just unpack vanilla in C:/XAMPP/htdocs/testforum, and you can access it via your browser at the URL http://localhost/testforum/.
If you google "XAMPP wordpress site" you'll get a few tutorials which will show you the basics of how to work with XAMPP.
You can download it here:
If you want to install a plugin, R_J wrote an excellent post: https://open.vanillaforums.com/discussion/33633/how-to-install-a-plugin-addon-theme
I had somewhat the same problem.
You have to delete /applications/vanilla/controllers/class.settingscontroller.php if you're upgrading from <2.4.
Whu606's stays valid: I'd try exporting and importing your database via your webhost and not bother with the porter:
I created a pull request for the Social Login addon a while ago.
You've got to change
$Sender->AddCssFile($this->GetResource('design/settings.css', FALSE, FALSE)); $Sender->AddJsFile($this->GetResource('js/settings.js', FALSE, FALSE));
$Sender->AddCssFile('settings.css', 'plugins/oneallsociallogin'); $Sender->AddJsFile('settings.js', 'plugins/oneallsociallogin');