Go to your Nexus account settings -> API Keys. Generate a new key and manually input it into Mod Organizer 2's download settings. This forces the client to use the "premium" API route even as a free user.
Do not install suspicious .exe files. Do not believe YouTube videos with "unlocker" links. Instead, use the tools Nexus itself provides, just in a smarter configuration. nexus download speed bypass install
Net time saved: No redundant downloading or API calls. Go to your Nexus account settings -> API Keys