Hi Edgemo,
Parallels Desktop 10 for Mac is designed to work with OS X 10.10, Yosemite.
As a Parallels Desktop 9 user, you can purchase the upgrade version of Parallels Desktop 10 from our website :
http://www.parallels.com/products/desktop/
System requirements for Parallels Desktop 10 for Mac is available at :
http://kb.parallels.com/en/122662
Parallels Desktop 9 for Mac will also work with OS X 10.10, Yosemite.
To install the upgrade version of Parallels Desktop 10 for Mac, please follow the steps as given at :
http://kb.parallels.com/122647
You can either upgrade your Mac OS X first and then install Parallels Desktop 10 or you can do the other way as well.
Before upgrading your Mac OS X to Yosemite, make sure to have backup of the existing Virtual Machine ( Windows 7.pvm )
The .PVM file contains the the windows operating system, files, folders and the applications that you have installed in it.
To locate the Virtual Machine on your Mac, please follow the steps as given at
http://kb.parallels.com/117333
To install the updates for Quickbooks please check with their support once in order to make sure that you install the update in the correct way.
Before upgrading your Mac OS X to Yosemite, please check with Apple Support to make sure your Mac has been backed up correctly so that you do not
loose any of your information.
Feel free to reach us if you have any additional questions.
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