The offline version with a user-friendly GUI can be downloaded from https://github.com/lmdu/krait

Reference

Du L, Zhang C, Liu Q, Zhang X, Yue B (2018) Krait: an ultrafast tool for genome-wide survey of microsatellites and primer design. Bioinformatics. 34(4):681-683. 10.1093/bioinformatics/btx665