It does not matter what is in the L directory. It's a good place to store the files, but they don't need to be there. You can as well delete them all.
Unpack the archive to somewhere, L or elsewhere. Then run HDToolbox, select your harddrive, click on Partition Drive, enable advanced options, click on Add/Update, select PFS3, click on Update, navigate to the directory where you unpacked the archive and select the pfs3aio file. Click Ok until you are back to the main screen. Then click on Save Changes to Drive. Exit HDToolbox and reboot.
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