Smart App Control blocking my app

Has anyone had issues with Smart App Control blocking their app. I have been marketing this app unsigned on the web not Windows Store for more than 20 years and now suddenly users in Denmark cannot use it.
The only solution is to turn off Smart App Control but that may cause security issues with their system so I’m very reluctant to give this advice. I’m also reluctant to pay the $800 price of a signing certificate to market what is almost freeware.