Hello Bumbo,
This might be because of problem with a dot net framework or firewall configurations. Please check your operating system has any pending updates. If any, please update.
Please check whether your operating system has dot net framework 4.5 or above? If not please install the same. You can download the dot net framework here, https://www.microsoft.com/en-us/download/details.aspx?id=30653 .
Also please make sure that AxCrypt is not blocked by your antivirus or firewalls. Then restart your system and install the AxCrypt app.
Then uninstall the AxCrypt app and restart the system then install the latest version of the AxCrypt app. You can download the same from our official website: https://www.axcrypt.net/download/ . Now install the AxCrypt app and try to start AxCrypting……
If the above doesn’t help, please provide more information about the issue and some screenshots and write a mail to support@axcrypt.net.