IDM (Internet Download Manager) vs ?

[jelson]

You could try what Grr said

Ash's Edit:Removed the comment partially.

It's likely they write something to the registry in a Classes | CLSID entry that says you first installed a trial version so that you can't find it and delete unless you know exactly what you're looking for.

I suspect that's why Grr suggested Sandboxie.

[Ashwin]

It's likely they write something to the registry in a Classes | CLSID entry that says you first installed a trial version so that you can't find it and delete unless you know exactly what you're looking for.

I suspect that's why Grr suggested Sandboxie.

Indeed. I found some registry files with Regseeker.