I've purchased (ARTIO Invoice #39750) the extension for VM2 to be used together with Joonsef 4.6.2 and Joomla 2.5.24. The extension doesn't install either from JoomSef built in installer (as well as Joomla installer). The error is:

Unable to detect manifest file
Error installing JoomSEF Extension

I've also sent you an email through your email address and from product link but didn't receive any answer. Now I'm trying to get your replay posting this topic, hoping to have a better luck.