Unexpectedly an add-in built in 2.1.2 environment doesnt' work in ArcGIS Pro 2.0. I've attached test add-in with a single button in 'Add-In' ribbon group. Clicking the button disables it saying that button class is not found.
desktopVersion="2.0" but add-in doesn't work.
Version of the software used to build the add-in:
ArcGIS Pro 2.1.2
ArcGIS Pro SDK for .NET 188.8.131.5257
ArcGIS Pro SDK for .NET (Utilities) 184.108.40.20657
2.1.2 is not a major version so I suppose add-in should work. Add-in was created just from VS template, nothing changed in it.