Version Compatibility

I have installed UE v4.25 and just downloaded Polygon Citypack v4.23. Having challenge adding Citypack to existing project. created in 4.25.
Can Citypack be used with existing installation? Can I install UE 4.23 in addition to UE 4.25?

You can choose to install the asset regardless of the launcher thinks.

When it says ‘no compatibile projects found’, just check the ‘show all projects’ box, then you can install it.

Thank you!