This method allows you to download Mavericks and Yosemite by logging with your Apple ID - only if you previously downloaded them from the Mac App Store. The purchased section lists only those operating systems that you had downloaded in the past. The main challenge is to download the OS installation file itself, because your Mac may already be running a newer version. Normally, it is assumed that updating OS is a one-way road. It deletes system junk, old broken apps, and the rest of hidden junk on your drive. Here are some ideas to free up space on your drive. Next, you will need enough disk space available, for example, to create Recovery Partition. Note, that it is recommended that you install OS on a clean drive. This includes not just space for the OS itself but also space for other applications and your user data. To begin with, some of your apps may not be working properly or simply crash on newer operating systems. There are many reasons that could point you to this radical decision. It removes only safe-to-delete files and is notarized by Apple. As a first step, you may try deleting your outdated system files.
