The first link in the knowledge base, named "Download old versions" tells me:
When your registration code is no longer valid for the most recent version of FileLocator Pro and you need to re-install an older version you will need to login to the MyAccount section of the web site: http://www.mythicsoft.com/login.aspx
So where do I find those? I clicked the link cited above, logged in successfully, can see my "Account details" and "Registrations". But I didn't found any older version.
Reason I want to downgrade is that just after the latest upgrade, I can't cancel any long searches, FileLocator Pro just doesn't respond any more. It is the 64-Bit version used on Windows Vista.
Btw, another minor glitch of 6.2 (Release Build 1254 - 2012.07.03.54051): if results of a search are displayed and I change to the "Text" tab, the highlighted text (yellow background) is garbled until I click into that text field.
Edit: Specifically I'm looking for version 6.0 (1236)