Run the game once, then download Diva Mod Manager[gamebanana.com], and set it up as listed on the page. From here you can download mods either in the mod manager itself (GB Mods tab), or the gamebanana website. Turn off MegaMix Mode (Options>Visual Settings>Future Tone) and turn off uploading to the leaderboards (Gallery>Ranking>Upload Settings). Risk a ban and funky graphics otherwise.

• DivaNoSpy[gamebanana.com] Disables the Denuvo stuttering garbage
  
• High Refresh Rate[gamebanana.com] Unlocks framerate, which can be edited in the mods/High Refresh Rate/config.toml file in the directory, I recommend 60fps. The game's own frame limiter is garbage and breaks over time.
  
• DivaBackup[gamebanana.com] Backs up the save data in case steam cloud or save data ♥♥♥♥ ups
  
• Miku sIngs SEGA[gamebanana.com] Miku will sing SEGA at the SEGA splash screen, as intended by the Gods

• 720p Movies - Base Game[gamebanana.com] Recommended on a lower-end PC to reduce lag
  
• EXPatch[gamebanana.com] Recommended if you're downloading custom song packs, as most don't have hard charts, and this mod removes the need to play hard charts before the extreme chart unlocks
  
• Song Limit Patch[gamebanana.com] Removes the song limit of 300 which is necessary if you're going to have more than 300 songs, KNOWN BUG: Cannot earn VP with this, so you'll need to have the item unlock key DLC if you want modules other than the defaults/free
  
• Project DIVA F2nd Song Pack[gamebanana.com] Adds songs from Project Diva F2nd
  
• Project Hoshikuzu+ Song Pack[gamebanana.com] Huge song pack with some hard, but mostly extreme charts NOTE: You must download through the GDrive link, and then drag and drop the file into DMM
  
• Project Diva X Song Pack[gamebanana.com] Adds songs from Project Diva X
  
• Eden Project (Formerly MMFX)[gamebanana.com] This includes tonnes of new songs and their own PVs, plus extra charts for other MM+ songs. NOTE: You must have the extra song pack DLC to use this
  
• Black★Rock Shooter Module 4.0[gamebanana.com] Adds the Black★Rock Shooter Module
  
• PDRPC - Discord Rich Presence for Mega Mix+[gamebanana.com] Adds Discord Rich Presence so you can show off to your friends that you're playing SM∞F on extreme
  
• Disable Watermarks[gamebanana.com] Disables the watermarks on the PV, if you'd like clean screenshots
  
• PS4 Module and Item Icons[gamebanana.com] Changes to the PS4 Icons and pretty much removes the god-awful toon shader
  
• English Lyrics[gamebanana.com] Changes the on-screen lyrics to English, includes an extra download for the F2nd songs, currently doesn't include X HD however. There are also lyric mods for other languages, currently all I could find are Chinese, Korean, Vietnamese
  
• English Lyrics for Song Packs[gamebanana.com] Replaces the now obsolete English lyrics mod by the same creator.
  
• Restore Korean Censored[gamebanana.com] If you live in Korea, this is a must-have if you want to play Senbonzakura, and Oheda Julia-Night, as they are region-blocked
  
• Add Shirt Lights[gamebanana.com] Gives cute lights to the main Miku module :)
  
• BetterDivaPractice[gamebanana.com] Adds a better version of the practice mode. IMO it's pretty crucial, but it depends on how much you value being able to checkpoint at integers and fast-forward through parts of the song.
  
  There are a tonne of mods for modules, including for the PDF2nd and X HD song packs that are easy to find, so go wild with those!

Please let me know if there are any mods you'd like me to add, and don't forget to make a gamebanana account and like the mods you enjoy! I didn't see a guide for modding on this game, and necessary mods to install, so I made one myself! Please like and favourite if you enjoyed <3