I have purchased a few of these "online" game installs, and I've found that it's a good practice to do the initial install, activate, apply any available patches, and immediately burn the game folder and any other user files, registry entries, activation info, etc. to disk for subsequent re-installs.
Using this method, I've re-installed both rFactor and netKar Pro with no re-activation needed.
I hope this helps!
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