1. Double click the .JAR file to run it. Note that if double clicking the file doesn't open it you can also run it from command line/console/terminal as described below:
Method 1 (Windows):
-Right-click JAR
-Open with 'Java Platform'
Method 2:
-Open command line (Windows) /console (Unix/Linux) /terminal (MAC)
-Navigate to where the installer is, for example it might be:
cd C:\Users\Example\My Documents\Downloads
-Type in the following: java -cp <DOWNLOADNAME> com.sijobe.installer.Installer
Where <DOWNLOADNAME> is the name of the .JAR file, ie: SinglePlayerCommandsV2.11.jar
2. Once the installation screen is up verify that the filepath that is displayed is
pointing to where Minecraft is installed.
3. Click the Install button and the installation will start, a popup message will
appear when the installation is finished.
Backup MCJAR - Allows you to backup the Minecraft.jar at the click of a button
Backup Worlds - Allows you to backup all your worlds at a click of a button
Note: Both backup methods put the backups into, .minecraft/backups