Windows should have mentioned about compatibility problems with Platinum 6. There is no upgrade for application enhance its compatibility because not even version 7 is compatible with Windows 10. Based on details found on Internet, the application requires Windows 98, Windows Me, Windows 2000, and Windows XP to work properly. At this time, the only way to use the software is through virtualization. Install VirtualBox, then add a Windows XP machine and you will have the possibility of running Platinum 6 without issues.
Note: You need an original XP installation disc or ISO.
Download Virtualbox: https://www.virtualbox.org/wiki/Downloads
Create a machine: https://www.virtualbox.org/manual/ch01.html#gui-createvm