You cannot find it on "official" ROM sites. You must join the Tokimeki Memorial Fan Discord (search Google for "Tokimeki Memorial Discord Server"—it is regularly re-linked on Reddit). Inside the Discord, pinned in the #tm4-translation channel, you will find a link to the patch file (a .xdelta patch) and the patching tool.
You might ask, "Why wait for a human translation when AI can do it now?" Because Tokimeki Memorial is about subtext. When a girl blushes and says, "B-baka! It's not like I studied hard for the exam for your sake!"—a machine translates that as "Idiot. I did not study for your examination." The nuance is lost. tokimeki memorial 4 english patch
The first serious attempt at a Tokimeki Memorial 4 translation patch began around 2012 on the and ROMhacking.net forums. A user named "HackingForFun" (a pseudonym that appears often in PSP translation lore) extracted the game's script files. You cannot find it on "official" ROM sites