I said you to search for Programs.
LimeWire shares its "LimeWireWin.exe" file with an extension specifying its version.
It's quite useful to see which LimeWire version are the most widely used (however users are still free to delete the installer from their default shared directory after the installation, so not all people will share this file).
I made such a search, and I immediately got 201 replies. Most of them for the version 3.6.9.10, followed by 3.5.8 and then 3.8.5. But even the current beta 3.9.9 could be located on multiple sources.
There remains some copies of LimeWire 2.x...

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