The most recent build of WinTD 5 is 5.00r, which was posted in December 2023.
Release Notes
If you have an early version 5 (5.00h or earlier, installed August 2022 or earlier), you will have to re-install the software using the original download link (which has the newer build)—we changed to a more straightforward automatic updater and the old one with the separate "WinTD Updater" program no longer works.
To update from any earlier version to version 5, use https://estima.com/shopcart/wintd_update.shtml