If you want to prevent your furry sims from having their socks unhidden, download the addon version.
However, you will need to manually replace the paws on the sims that you want to be able to wear socks in CAS (Create-a-Sim).
If you choose the replacement version, to undo the changes made by installing it, you will need to download the furry mod again and replace the 'furry_paw_plantigrade_f.package' and 'furry_paw_plantigrade_m.package' files with the ones from the fresh download or restore from a backup.
The templates mod relies on the addon version so if you want to use it, get that one.