Install guide

Every player in the session does these steps. It takes about five minutes.

S4OM is in early testing. Expect bugs, back up your saves, and report problems on Discord.

Easiest: the launcher

The launcher installs the mod, turns on script mods and starts the game for you. Windows may say the app is unrecognised - click More info, then Run anyway. Online play needs a token from Patreon sign-in; LAN play is free.

Prefer doing it by hand? Download S4OM.ts4script and follow the steps below. Checksums: SHA256SUMS.txt

Before you start

Windows PC with The Sims 4 installed and updated to the latest patch.
Everyone in the session should have the same expansion, game and stuff packs.
Back up your save. Go to Documents\Electronic Arts\The Sims 4\saves and copy the folder somewhere safe.

1. Put the mod in your Mods folder

Copy S4OM.ts4script into:

Documents\Electronic Arts\The Sims 4\Mods

Put it directly in Mods or one folder down. Script mods placed deeper than that don't load.

2. Turn on script mods

Start The Sims 4.
Open Game Options, then Other.
Tick Enable Custom Content and Mods and Script Mods Allowed.
Quit and restart the game. The settings only apply after a restart.

3. Check it loaded

After the game starts with mods on, this file appears in your Mods folder:

Documents\Electronic Arts\The Sims 4\Mods\mp_debug.log

If it's there, S4OM loaded. If it isn't, go back to step 2.

4. Allow it through the firewall

The first time you host or join, Windows may ask whether to allow The Sims 4 on the network. Click Allow, otherwise friends can't connect.

Problems

Mods stopped working after a game update. Each Sims patch turns script mods off. Turn them back on in step 2, then check #patch-status on Discord to see whether S4OM works with the new patch yet.
Friends can't connect. Check the firewall prompt in step 4. On the free LAN version you must be on the same network, or the host has to forward the port.
Something else broke. Post in #bug-reports on Discord and attach your mp_debug.log.