Hello Allan Hance,
We are checking with our local environment standalone versions are downloaded successfully.
You can download the AxCrypt to run it temporarily without installing using our portable(stand-alone) version, here: https://www.axcrypt.net/download/ .
Please note: It might be happened because of some firewall/antivirus or other third-party applications are blocking the AxCrypt app. So please check the firewall or other software settings.
still, you are facing any issue, please provide more information about the issue and write a mail to firstname.lastname@example.org.