If you intend to install the Mac OS X Yosemite public beta (10.10), please note that Parallels Desktop 8 for Mac will NOT run on the OS X Yosemite public beta. You will not [...]
Notes and Known Issues Installation It may be necessary to refresh the App Store Purchases page before Developer Preview 4 will appear in the list of purchases. Network [...]
Introduction OS X Mavericks Developer Preview 3 is pre-release software. Do not use this pre-release software in a commercial operating environment or with important data. [...]