I plumped for Yosemite too soon!

Mac Format - - MAC SOS -

Q At WWDC 2014, Ap­ple re­leased OS X 10.10 Yosemite for de­vel­op­ers to Beta test (I’m a reg­is­tered app de­vel­oper), so of course, I went and down­loaded the up­date. How­ever, I’ve found lots of bugs in it, and want to down­grade. My Mac won’t let me down­load Mav­er­icks on the Store be­cause I have a newer OS ver­sion. Dan A You should be able to down­load OS X ver­sions back as far as Lion from the Pur­chases tab in the App Store. But in­stead of run­ning the in­staller, you need to use In­ter­net Re­cov­ery mode.

The or­di­nary Re­cov­ery mode that boots from the hid­den par­ti­tion on your lo­cal hard disc sim­ply re­in­stalls a clean copy of the last ver­sion of OS X you in­stalled – Yosemite in your case. But In­ter­net Re­cov­ery re­verts to the ver­sion that orig­i­nally came with your Mac. Be­fore you do this, though, make sure you have a full backup, ideally us­ing some­thing like Car­bon Copy Cloner or Su­perDu­per!, rather than just Time Ma­chine.

Now re­boot with ç+å+R held down. You’re prompted to con­nect to your Wi-Fi net­work and it down­loads the in­staller and, even­tu­ally, OS X it­self. Af­ter that you can go back to the App Store and down­load the up­grade to Mav­er­icks, and then re­store your data from backup.

It’s prob­a­bly best to let the de­vel­op­ers find all the bugs be­fore you up­grade to OS X Yosemite.

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