no, unfortunately there isn't. I know some super old 4.5.x version is still supported by Microsoft, however the downside of supporting that old version would not be worth the effort on our side. So at this point 4.6.x is the oldest which is supported by the agent.
From the technical point of view: the agent uses some types which are not supported on 4.5, so we couldn't compile it for that version.
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