How to downgrade my minecraft version to 1.7.10?

Minecraft is constantly updating, and with each new version comes a slew of features and changes. These changes are designed to make the game better and more playable. But what if you liked it the way it was? Luckily, changing back to an older version of Minecraft is easier than ever, and you can still play online with others running that version.
1. Start Minecraft. You can use the Minecraft Launcher to load earlier versions of Minecraft. You must be running version 1.6 or later to access this option. You can use this method to play all the way from the latest "snapshot" to Minecraft Classic.
2. Click the Profile Editor tab. Click the Edit Profile button. This will open a new window.
3. Select your version. Click the "Use version" menu and select the version that you would like to load. Press Save Profile.
4. Restart the launcher and start your game. You will not be able to connect to servers that are running a different version, but you can play single player or on servers that run your version.