The drive/folder you install the sim doesn't matter. Our current installers always install in their own folder, outside the sim, and shared by all the supported sim.
You never have to repurchase anything from us. Just run the latest installers, and if you need to reactivate, insert your existing Serial Number. And, there's no need to download the Stand-Alone Addon Manager, since every FSDT product comes with the Addon Manager included.
Just download and install the latest full installer KLAX.