So you’ll need individual base NSP + update for each game (FFI, FFII, FFIII, FFIV, FFV, FFVI).
Goldleaf can queue multiple NSPs. Install all base games first, reboot the console, then install all updates. Never interleave base and update installations; the Switch’s ticket system prefers bulk base installs first. final fantasy pixel remaster switch nsp update install
You are attempting to run a base game that has a known higher-version update available in your system's metadata. Install the latest NSP update to bypass. So you’ll need individual base NSP + update