You may have seen this warning recently when starting TntConnect for Mac on macOS High Sierra 10.13.4 or later:
We are aware of the need to get TntConnect ready for the next version of macOS. Although Apple hasn't officially announced anything yet, the presumption is that macOS 10.15 will come out in the fall of 2019, and it will probably require 64-bit applications, which TntConnect for Mac is not currently ready for.
TntConnect for Mac is based on a technology called WINE, which is an open source project that allows Windows based programs to run on Linux, Mac and other platforms. We're currently waiting for the WINE project to put in the necessary functionality for running 32-bit applications on 64-bit platforms.
Once the WINE project catches up, we hope to release an all new version of TntConnect for Mac that should run on macOS 10.15.