Before you remove Lightroom and Photoshop, please sign out or Deauthorize the applications.
To do so : Click on Help > Sign out
You do need the previous versions to be installed on your computer. You just need to have the previous version serial number in order to complete the activation of the upgraded product.
Jim from Augusta wrote:
I need to uninstall Lightroom 5.7 and Photoshop 6 and reinstall once 10 is installed.
The Sign Out process is required for decativating CC applications, such as LR CC 2015 and PS 2015.
LR 5.7 does not use activation and can be uninstalled and reinstalled without any deactivation.
I assume you mean PS CS6. Go to Help> Deactivate.
Once the Windows 10 installation is complete you can reinstall LR and PS using your serial numbers.
Thanks for the help; that project is scheduled for today.
Jim Van Ells