Trest insight's use and problems found

First of all, no category exists in tms support center for Trest insight

I try to use the Trest insight and I have the following problems:
a. The downloaded version is but in the web site versioning a exists
b. Loading a save request in the headers section the Names are not loaded. In the Json file, they exist
c. Pressing the Send button I have in less than a second an error: "This request timed-out. Please check the configuration of the url." The url as shown in the line at the left of send button seems to be OK and if I copy it to my browser it works. Is it using a hidden proxy or no standard dns servers?

A useful addition could be also to have undo function edit fields.
Thanks for this util