Several major developments, the most important for the person fresh-installing SH4 again is
Rockin Robbins' SH4CMS utility. Another is CapnScurvy's discussion on the use of LAA for better RAM management for the game... unfortunately, I cannot find the thread again... hang on... or CapnScurvy will be along by tomorrow.
Edit: I actually found it!
CapnScurvy'sWindows10; Large Address Aware; SH4 Install - and like Raider M says below: "Welcome back to SubSim"