Asked the same question in August of 2018 about TT being a 64 bit program and the response was:
"I have forwarded your query to our development team, if found feasible we will surely fulfill this requirement in the future version of TemplateToaster."
And obviously it's now a 64 bit program and not in the (x86) folder.
As usual, notifications, news and update notes/fixes are not at the top of the list.
(On your home page you might state the program is 64 bit or compatible with 64 or 32, etc. I did not see it. Or did I miss it?)