Hi All,
We are trying to connect VS2015 in one of the DEV environment(already installed) by applying the Product key for VS2015, (one of the ex-colleague used to connect VS2015 without any issues but it is not working for us).
Our current Production version is:
Getting the below info while trying to connect VS,

After closing the above info, we are unable to see any customized models created for the application in the Model management tab. It is displaying all the standard models.
If we deploy a new DEV VM, will it contain VS2017 and customized Models and all the existing customization which is there in Production? or do we need to restore database from Production.
Please advise us.