Even a stable version isn't immune to local conflicts. Here is how to fix the three most reported issues for this build.
Windows Defender sometimes falsely flags legacy installers because they modify network adapters. Disable real-time protection for 10 minutes, install the VPN, then re-enable it. download nordvpn v6.33.10.0
Here is the exact method to obtain this legacy version without compromising your security. Even a stable version isn't immune to local conflicts
Blocks ads, trackers, and malicious websites directly at the DNS level. How to Download and Install Safely install the VPN
Specifically optimized for older operating systems like Windows 8.1, Windows 8, and Windows 7 (though security updates for these OS versions are limited).