We do not have a download file for the latest version (1.13.0.4395), but you can try downloading it from the developer's site
Download version 1.7.1.1263 from Mac Informer
Version: 1.7.1.1263
Date update: Jun 30, 2021
File name: buchla_easel_v_1_7_1_1263.pkg
Size: 208 MB