I&#x27;m also really purturbed by apple&#x27;s &#x27;version ratchet&#x27; (great term btw).  In my case it&#x27;s the infuriation caused by the &#x27;notifications&#x27; to upgrade ... Which you CANT DISMISS!  It&#x27;s either install, or &#x27;remind me later&#x27;: tonight..tomorrow, but explicitly not &#x27;never for this version&#x27;.  I&#x27;ve turned off notifications altogether on Yosemite.  Ios9 is the icing on the cake.