Some apps' newest updates may cause problems when installed on older devices, or they may not work properly due to incompatibilities with some Mac architectures. While the developers are working to correct these issues, one option is to roll back to previous app versions. If you need a specific Mullvad VPN version, you can access an archive from Uptodown, where you can download previous versions of Mullvad VPN for Mac knowing that they are virus-free and free of charge.