Version 188.8.131.52 of the JT Open Toolkit is available for download from the GTAC ftp server.
The JT Open Toolkit can be downloaded from the GTAC ftp server here:
Select “Download and Upload Files” from the Explore GTAC list. Scroll to “JT Open” in the “Product Filter” and pick the installer for the platform you want to work with.
A WebKey account is required to access this site.
A JT Open Toolkit install key is required to complete the install.
I can't find the download. JT Open is not mentioned in the product list.