If you need the raw JAR file to install old-school mods manually or setup a legacy server, you can grab it from your computer after completing Method 1. Press Windows Key + R to open the Run dialog box. Type %appdata%\.minecraft and hit . Open the versions folder. Locate the 1.5.2 folder.
Version 1.5.2 was the final patch for the Redstone Update. It introduced blocks that are now considered essential: minecraft 1.5 2 jar file download