Board Thread:LotR Mod Technical Support/@comment-25330335-20150131155904/@comment-27172148-20151110033948

To re-install Minecraft you simple go to https://minecraft.net and select the fine print that says "Already bought the game? Download it here". You don't need to log into your Mojang account for this.

Then, personally I'd click the fine print link for "Show All Platforms".

If you're running windows download the Minecraft.msi file and run it.

If you're on Mac you can download the Minecraft.dmg

If you're on Linux, you can download the Minecraft.jar. You can also use the Jar on Windows and Mac as well, but the msi / dmg files for those, respecitively, is easier for most people.

Then, you can proceed with my 1-5 steps.

Finally, if you don't know where to download Minecraft Forge 1.7.10 Build 1230 (i.e. Step #3) you can go to files.minecraftforge.net to grab that.