Almost there!
Go back to Simpl, "Project", "Configure System".
Move the HD-MD 8x2 (just drag and drop it) to the IP-ID that the HD-MD 8x2 is configured for: 3
Recompile and upload.
Double check the IP address of the PRO 3, should be 192.168.1.160. If not, adjust the IP table entry in the HD-MD 8x2, it should point to the PRO 3.
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Best regards
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Crestronfreak55