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? platform=win32&architecture=x86
or even more direct:
https://www.deezer.com/desktop/download/artifact/win32/x86/5.30.590
→ Mac users:
https://www.deezer.com/desktop/download? platform=darwin&architecture=x64
or even more direct:
https://www.deezer.com/desktop/download/artifact/darwin/x64/5.30.590