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 (10.3.90), but you can try downloading it from the developer's site
Download version 10.1.70 from Mac Informer
Version: 10.1.70
Date update: Feb 23, 2020
File name: mac-fonelab.dmg
Size: 46.8 MB