Fatal error when install

The reason is that yu are using a pre 5.3 version of PHP. This is being tested on activation, but while refactoring the code this usage of static must have slipped through and is now used before the version test.

I will fix that with the next release, but activation will then fail for you because the PHP requirements for WPPP aren’t met. When I finished reworking the code, I might change the behaviour so those parts of WPPP, which don’t require PHP 5.3 or later will work. But for now you would have to upgrade PHP. Sorry.