https://arukateru.com/glass8 up to Windows 10 version 1909
You can get transparency (without blur) on newer versions using Stardock Curtains
Of course if you really want blur on newer Windows 10 versions you can use WindowBlinds with BetterAero7x theme (search it on DeviantArt)
On Windows 11 you can get blur using MicaForEveryone (installation process is extremely buggy, iirc you have to install the certificate and the MSIX bundler)