OpenNumismat macOS 10.13 issue

I'm not the developer of the program but maybe this will help
https://opennumismat.github.io/open-numismat/faq.html#:~:text=System%20Administrator%E2%80%9D.-,For%20macOS%20users%20read%20Safely%20open%20apps%20on%20your%20Mac%20and%20How%20to%20Fix%20%E2%80%9CApp%20Is%20Damaged%20and%20Can%E2%80%99t%20Be%20Opened%E2%80%9D.,-My%20antivirus%20detect