A modified VPN client may not actually encrypt your data. It could act as a "Man-in-the-Middle," sending your unencrypted browsing history directly to the person who created the crack.
Here is the safest and most effective way to access ExpressVPN and its features: 1. Start a Risk-Free Trial Express Vpn 6.6.0.4121 Key
Based on ExpressVPN’s release notes for the 6.6.x branch: A modified VPN client may not actually encrypt your data