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Repository Version
From 8.5 Update 1 onward, all versions of TestArchitect Client 8.5 and Repository Server 8.5 will be compatible with each other.
The backward compatibility diagram:
For example:
TestArchitect Client 8.5.6 will work smoothly with a Repository Server running 8.5.1.
However, if you were to big upgrade to 8.6 you would need to uprgrade both the Repository Server and TestArchitect Client.