We do not have a download file for the latest version (3.1.4314), but you can try downloading it from the developer's site
Download version 3.1.4314 from the developer's website
Version: 3.1.4314 (x64)
Date update: Oct 17, 2020
File name: Unitex-GramLab-3.1_win64-setup.exe
Size: 44.7 MB