Prism Launcher Modpacks & Mod Downloader
Download and update modpacks from Modrinth, CurseForge, FTB, Technic, and ATLauncher directly inside Prism Launcher on Windows.
SkyFactory 4 & FTB StoneBlock on Prism Launcher
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Void-world and underground automation classics with quest books and zero-to-reactor resource trees. Runs on Forge (1.12.2 / 1.16.5 / 1.20.1) with 4 GB – 6 GB RAM and Java 8 or Java 17.
- Modpack
- SkyFactory 4 & FTB StoneBlock
- Source Platform
- CurseForge & FTB Legacy
- Mod Loader
- Forge (1.12.2 / 1.16.5 / 1.20.1)
- Recommended RAM
- 4 GB – 6 GB
- Java Requirement
- Java 8 or Java 17
How to install SkyFactory 4 & FTB StoneBlock in Prism Launcher
Void-world and underground automation classics with quest books and zero-to-reactor resource trees.
Click **Add Instance** on the Prism Launcher toolbar, choose **CurseForge** on the left sidebar, search for **SkyFactory 4 & FTB StoneBlock**, and click **OK**. Prism downloads the manifest and all mod JARs into an isolated instance folder.
Recommended Java and memory settings on Windows
- **Java runtime:** Java 8 or Java 17. Configure this under Java Settings so the pack does not fail the startup compatibility check.
- **Memory allocation:** Set Maximum Memory (`-Xmx`) to **4 GB – 6 GB** under Edit Instance → Settings → Memory.
- **Need the app?** Grab the Windows installer or portable build from /download.
Frequently asked questions
What if CurseForge blocks a few mods while installing SkyFactory 4 & FTB StoneBlock?
Prism Launcher opens the download pages for any blocked mods and watches your Windows `Downloads` folder automatically — click Download in your browser and Prism moves the files into place.
How much RAM does SkyFactory 4 & FTB StoneBlock need?
Allocate 4 GB – 6 GB under Edit Instance → Settings → Memory, and ensure you are running 64-bit Java 8 or Java 17.
Get Prism Launcher
Windows, macOS & Linux
Free and open source. Sign in with the Microsoft account that owns Minecraft, then create your first instance.
