Have you tried the Windows 10 upgrade? I also have an older model, Dell XPS L501x.My system also was NOT tested for the Windows 10 upgrade.
I upgraded to Windows 10 from Windows 7 64-bit and the upgrade went smoothly. I just checked and I have Waves MAXXAUDIO3 on my Windows 10 system.
Original poster, If you have solved your problem, can you please mark the correct thread(s) with your solution. Thanks
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#MicrosoftMVP - Windows Expert-Consumer April 1, 2012 to March 31, 2015