I purchased HD Pro 2014 in early 2014, along with a Apple Laptop Computer. I had to purchase Windows 8.1 and have it installed on my computer also so that HD Pro would operate. It is working fine, except that I now have two operating systems running at the same time, and it uses up space and energy. QUESTION; If I upgrade to the 2015 HD Pro. and run it on the latest Apple Operating system. DO I need to completely remove everything (windows 8.1, parallels, and HD Pro.) so that the NEW 2015 HD Pro works with out a hitch?