If your PS4 is fully updated (firmware 10.0 or higher) and connected to PSN, you cannot install FPKGs. Here is the legal route:
Hamster has released individual, arcade-perfect ports of: Metal Slug Ps4 Pkg
A "powered up" version of the PSP hit, released on . If your PS4 is fully updated (firmware 10
Metal Slug Anthology Platform: PlayStation 4 Format: PKG (Installation Package) Genre: Run-and-Gun / Action / Arcade Developer: SNK Playmore Publisher: SNK / Hamster Corporation (ACA Series context) Metal Slug Anthology PS4 PKG
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