Gamebooster recently update from v1.5.1 (or 1.6) to v2.0. The older version was freeware, but the newer version is shareware, and requires payment for some features that were free earlier.
With his in mind, I suggest that you do not upgrade to v2.0 if you have the older version, which IMHO is better.
I unfortunately downloaded the update over my previous installer, and don't have v 1,5 anymore. If any of you have the previous installer, could you please upload it somewhere? Please note that I am not asking you to do anything illegal - as the previous version s freeware, but just not easy to find (all the major download sites such as CNET have also updated to v 2.0). Thanks!