Hello,
Not really sure on what do you mean by Software maintenance? Fences V3.10, currently on Beta, should work with current Windows 10. If you purchase now, you will get Fences V3.0.9 and later should be able to update to V3.10 after it release.
As for Fences 4 and Windows 11 support, there is no official announcement on it yet.
Thanks
Basj,
Stardock Community Assistant.