Access to multiplayer trade is possible with the scroll bar at the bottom without even having the GBT, by:
1. Wait for the scroll bar on the bottom to show a message of "Sold: ...".
2. Click on the message.
3. The GBT interface is opened. Any trade can be done as if the GBT is bought.
My Colony v1.1.0, Windows 64-bit edition.
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Early unlock of trade, not requiring GBT.
#1 2020-01-06 09:37:50