Hi!
I have the same problem.
Version 4 is available on Google Play only for some devices.
I have 5 devices and 2 have version 4 and 3 have version 3
Two new smartphones are identical and have been installed at the same time and are not yet used. 1 have version 4 for the first one and the other one version 3 !!!!!
How to have the same version for everyone?
Version 4 is not available for everyone, even after uninstalling reinstalling version 3 is the only proposed.
Propagation problem on Google play maybe?