Open the admin panel of your store and install via the Localcopy modifier installer (for your OC version), if not already installed.
Open "Extensions -> Install extensions", install the file unishop2_fix.ocmod.zip and then MUST update the modifier cache.
Open "Extensions -> Install extensions", install the file unishop2_v2.8.2.0.ocmod.zip.
Open "System -> Users -> User Groups", the administrator group. There, in the first and second windows, select everything and save.
Open "Extensions -> Extensions".
In the drop-down list, select "Modules", enable all modules associated with UniShop2 (so that there are no errors) and at the end open "UniShop2 - Template Settings".
