The following warnings appears during migration from one Plesk to another:
The managed runtime version 2.0 is not available on the destination server
Failed to synchronize subscription with plan
Migration tools tried to perform operation in 3 attempts: Plesk error : managed_runtime_version - Description: . Requested: 2.0. Allowed: 4.0
ASP.NET 2.0 is not installed on the destination server.
For Windows Server 2012 R2 and higher
Since .NET 2.0 and 3.0 are included into .NET 3.5 package, it is required to install .NET 3.5 on the destination server.
Refer to the below article for details:
How to enable ASP.NET 3.5 on Plesk for Windows Server 2012 and 2016