VMware Workstation e.x.p build-1245816 tells me that "this beta has expired. You need a newer version to power on virtual machines".
But:
There is only a new license key available, announced to expire by October 15, 2013. I can't enter this new key, because the button to click is greyed out!
The download button leads to the very same version: VMware Workstation e.x.p build-1245816. Installing this version leads to an installed VMware Workstation e.x.p build with no way to enter the license key given …