The vast majority of PS4 ROM archives are designed for or 11.00 (with varying success). Sony patched the WebKit exploit used for homebrew after 9.00. If your PS4 is on Firmware 10.01 or higher (excluding exploitable 11.00), you currently cannot install ROMs.
Go to Library > Purchased. Select the game, and then select Download. The game will install automatically. PlayStation Installing PS4 Apps remotely over the Network on 11.00 ps4 roms archive install
: Move your .pkg files to the root directory of the USB drive. Do not rename them, as changing Title IDs can cause errors. The vast majority of PS4 ROM archives are designed for or 11