Danny, the paid version does deal with programs from the x64 Program Files. That is their trick. They lure you in with the x86 and then when you migrate to x64 they want you to pay.
But usually it is not such a big problem because even on an x64 system, most progrmas are in the x86 Program Files.
Here are a few specialized uninstallers that might be handy: Other Software | Uninstallers
And those are for AV programs: AV Uninstallers