Modrinth App (my recommendation)

Easiest way to update the modpack down the line.

Recommended Java settings

Access these Settings from the cogwheel at the bottom left of the App under [Java Installations] and [Default instance options].

• I personally use Temurin JRE. Installing java is a fuck, you can figure this out yourself or use the default one.
• 6144 MiB memory at minimum. I personally use 8192 MiB.
• Launch Arguments:

-XX:+UnlockExperimentalVMOptions -XX:+DisableExplicitGC -XX:+UseG1GC -XX:ParallelGCThreads=12 -XX:-UseGCOverheadLimit -Dfml.ignorePatchDiscrepancies=true -Dfml.ignoreInvalidMinecraftCertificates=true -XX:MaxGCPauseMillis=50 -XX:SurvivorRatio=8 -XX:TargetSurvivorRatio=90 -XX:MaxTenuringThreshold=15 -XX:SoftRefLRUPolicyMSPerMB=10000 -XX:ReservedCodeCacheSize=2048M -XX:+UseStringDeduplication

Installation

1. Get the Modrinth app from here.
2. Login to the app with your microsoft/mojang account in the top left corner.
3. To install the modpack, search for Horizon - Gotek's SMP in the Modrinth app and get the newest version.
4. You're done. Run the modpack either from the home or library screen of the app.

Updating

1. Create Backups of your existing Instance. These are the important folders:

/minecraft
.
├── config
├── Distant_Horizons_server_data
├── _IAS_ACCOUNTS_DO_NOT_SEND_TO_ANYONE
├── replay_recordings
├── resourcepacks
├── saves
├── schematics
├── screenshots
├── shaderpacks
├── texturepacks
├── xaero

2. Go to the installed modpack in your library
3. Go to the content tab of the modpack.
4. To the right of the search bar there should be a green "Update Modpack" button. Choose the latest version.
5. Apply backups. I recommend using the config that came with the updates, as I cannot control/support mod configurations that differ from the modpack.