Little-known anti-malware programs display warnings, which are often identified as false positive. Nevertheless, it is recommended to recheck the file with your antivirus software after downloading.
We do not have a download file for the latest version (1.5.2), but you can try downloading it from the developer's site
Download version 0.2 from Mac Informer
Version: 0.2
File name: com.horstmann.violet-0.21.1.jar
Size: 1.7 MB