Hello thanks for the report! I’m not very knowledgeable about windows antiviruses, so can’t help you there unfortunately. I’d say that, in general, if in doubt, is probably is best to not install (the app is not even signed with windows store)
v2 was temporarily unavailable for a bit just recently but It should be online again.
About JS.Siggen5.44590 its seems to be related to https://github.com/medikoo/es5-ext package which is a dependency, of the app. check out this topic: https://github.com/medikoo/es5-ext/issues/186