Thank you for opening this post on Community. As per the latest Help Centre (9.0), The ThingWorx Protocol Adapter Toolkit is deprecated as of this update of the help center, August 2020.
You can check the 1.5.1 only with your version i think it should work fine since the major release is 8.5
1. What's the replacement of PAT in Thingworx 9.0 ?
2. I can only find the document of 1.5.1 but cannot find the software, do you know where I can download it ?
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