Check the build before installing
The direct download on this site is version 1.0.16. Its Fabric metadata declares Minecraft 1.19.3, Fabric Loader 0.14.11 or newer, Fabric API and Java 17 or newer. Those values matter more than a broad search result because they describe the file you are actually installing.
Install Fabric Loader and Fabric API
Create or select a Minecraft 1.19.3 profile, install Fabric Loader for that version, then add a compatible Fabric API release. Keep the loader and API aligned with the same Minecraft version to avoid dependency messages at launch.
Place the JAR in the correct mods folder
Copy accurate-block-placement-1.0.16.jar into the mods folder used by the profile you will launch. Multi-instance launchers can keep separate folders, so confirm you are editing the right instance instead of a global Minecraft directory.
Launch and verify
Start the Fabric profile. If Minecraft reports a missing dependency or version conflict, return to the declared requirements rather than trying to force the JAR into a Forge or newer-game profile. Test the mod in a backup or creative world first.
Use a clean profile for the first test
A separate Minecraft 1.19.3 profile makes the first launch much easier to diagnose. Keep only the required Fabric components and the Accurate Block Placement Mod JAR in that profile at first. When the game starts normally, add the rest of your preferred client mods in small groups. This approach gives you a clear baseline and prevents an unrelated mod from being mistaken for an Accurate Block Placement issue.
Before launching, confirm that the profile is actually using Java 17 or newer and that its game directory is the one you edited. Launchers that support multiple instances often keep their own mods, config and log folders, so checking the active path is more useful than repeatedly copying the same JAR into different folders.
First-launch verification checklist
- Start the Minecraft 1.19.3 Fabric profile, not a vanilla or Forge profile.
- Confirm Fabric Loader meets the 0.14.11+ requirement shown for this version 1.0.16 build.
- Keep a matching Fabric API in the same instance.
- Confirm Java 17+ is selected by the launcher.
- Test in a creative or backup world before using an important save.
If the launcher stops before the main menu, read the first clear dependency or version message in the log. A missing API, wrong game version or wrong loader is normally more useful than the final generic crash line.
Keep upgrades separate from installation
Installing a known 1.19.3 build and upgrading Minecraft are two different jobs. First verify that version 1.0.16 works in the environment it declares. If you later move the game to a newer release, create another profile and verify a mod release that explicitly targets that version instead of carrying the old JAR forward and hoping the loader accepts it.
This profile-by-profile method also makes rollback simple. Your working 1.19.3 setup remains available while you test another Minecraft version, loader or mod combination without changing the known-good instance.
Keep the working instance easy to reproduce
After the first successful launch, make a short note of the exact Minecraft version, Fabric Loader version, Fabric API build and Java runtime used by the profile. Keeping those details with the instance saves time later if you reinstall the launcher, move the game to another computer or troubleshoot after adding more mods.
It is also useful to keep the downloaded JAR in a clearly named backup folder outside the active mods directory. That way you can restore the same known file without searching again. When you intentionally update anything, change one component at a time and launch between changes so you always know which update introduced a problem.