Welcome to the community. Great having you here. 
Sorry to hear of this issue you’re having. It does sound like a classic case of a security program, like an antivirus on a PC or firewall on a network, blocking the trainer from either downloading or injecting. Some troubleshooting is below:
-
Are you using your own internet? Or internet which belongs to an educational institute like a college or university?
If it’s the latter, you’ll need to use a VPN so that the trainer can download, because the school will have an additional security program on the network that you have no control over. Windscribe is one VPN that I’ve seen recommended, which has free options. -
Are you certain WeMod is added as an exception in your antivirus? Double check from this thread: “Wemod failed loading the cheats into your game” / “We’re having trouble downloading the cheats” - WeMod Support.
-
Open your antivirus and go to the quarantine menu (also called the virus chest in some programs). Have a look for any WeMod files in there which may have been quarantined despite you adding it as an exception. If there are any, whitelist and de-quarantine it from here.
-
Try updating or repairing .NET Framework. I’d recommend updsting to version 4.8 if you haven’t already. Here’s the official link to Microsoft’s .NET Framework download website: Download .NET Framework 4.8 | Free official downloads.
Still an issue? Aside from Cyberpunk 2077, what other titles are you trying? And are they all legitimately purchased or have you been naughty and pirated them?
Keep us updated.