Hello George,
Can we get an update on the below error. As we too are getting the same Error.
I have created all my Projects in ArcGIS Pro 2.1.1....And still I am using the same Version of ArcGIS Pro 2.1.1...But I am having issue in Opening up the ArcGIS Pro Project as "Opening the Selected ArcGIS Project Failed. This Project was saved using a newer Version of ArcGIS".
Note:
We have not updated any new Version of ArcGIS Pro.
Really appreciate if anyone can Provide with a Solution.