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EDIT: I don't run a dedicated server.
this is a problem... first because for example in this moment the new refresh hotfix released the 30th July exists only for the dedicated server and then because modifying the server for allowing old clients to join is easy to do with the dedicated one while for the client is required a memory patcher (like a launcher for halo.exe).
anyway the only solution I have is the usage of the 1.07 dedicated server modified to allow any client of any version or of a specific version to join, which seems to work very well.