You are right, last version was 1.60! I believe there is an update on Aminet, but i remember that the last updates of Termite TCP were commercial, with a discount if you had previous versions, but they were not free for users with old versions.
On the other hand, it only allowed dial-up connections, it had no SANA support. The advantages of using it, were that it was very easy to use and required very little resources (min requirements: 2.04 and 1MB ram) compared to other stacks.