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.
(Sega Saturn): A translation project is currently seeking help for debugging a crash-prone build as of April 2025. tokimeki memorial 4 english patch
After years of development, debugging, and quality assurance, the patch was finally released, effectively cracking open a game that had been exclusive to Japan for over a decade. You cannot find it on "official" ROM sites