The following link provides a download for Windows Mobile Device Center 6:

Windows Mobile Device Center 

To install the Windows Mobile Device Center:
1. Download the Windows Mobile Device Center Installer to your PC by clicking on the download link.
2. Select ‘Run this program from its current location’ and click OK.
3. Follow the instructions on the screen.

Please note: Your mobile device must be connected to your PC for the Windows Mobile Device Center to launch after installation.

To use this with PCs running Windows 10, the following registry fix will need to be downloaded and installed:

Korec Support: Windows Mobile Device Center Registry Fix for Windows 10/11