What do you mean by "Really old minecraft version"? My minecraft version is currently the latest version (1.16.4) and so is the forge I am trying to download. (The last topic was closed for discussion so I started a new one) It would be greatly appreciated if you can answer my question.
As shown in picture, the three libraries cannot be downloaded (and also the forge downloading speed is extremely slow). My internet connection is normal, and I tried and used an VPN in process. I have tried the method of running the java -jar command in powershell, as many answers have suggested, but still the problem remain unsolved. What else could be the potential problem?