The Windows version of the desktop app can be downloaded from the Microsoft Store or - even easier - directly from the Deezer page:
https://www.deezer.com/download/
The appropriate version is offered for download. 
Attention: The above link directs Windows users to the Microsoft Store.
If you want it faster, you can download the latest version for Windows and/or Mac via direct download link without having to switch to the Microsoft Store or the Deezer homepage. 
→ Windows users:
https://www.deezer.com/desktop/download/artifact/win32/x86/6.0.90
→ Mac users:
https://www.deezer.com/desktop/download/artifact/darwin/x64/6.0.90
