The latest is 1.7.2 -- however, if you're currently at any version below 1.6.0 you'll need to first update to 1.6.0 then to 1.7.2.
Instructions for updating to 1.6.0 are here on the support page: [
www.handibot.support]
The link to download the 1.7.2 update is on the main page handibot.support under the bulletins heading.