Got a similar problem; the proxycap (x64) expired and then I downloaded the keygen from that other thread but all I got was the core, cr-pc426.zip and file_id.diz. No keygen.
And I can't try the keys posted around either, since I get the buy now even after reinstalling it twice (I used CCleaner on my 2nd attempt). The thing is that after starting the computer, after restarting the pc after install, I get the grey proxycap icon on my toolbar, like always. Right clicks and chooses "activate" and I get the "buy now". Another thing worth noting is that after reinstalling it still remembers the last proxy and the files I use proxycap for, and this is after running ccleaner after uninstalling.
Help?