Purchase this if you purchased multiple items in which you want installation support for. You must purchase one installation support for each item you
want support for.
If you purchase 5 items (Parasites, Sillent Steps, etc.), and want support for all of them you must purchase 5 installation supports.
If you purchase 5 items (Parasites, Silent Steps, etc.), and only want support for 2 of them, you must purchase 2 installation supports.