[Installer flashback]

35 minutes ago, DaemonUmbra said:

I'm assuming the installer is in your downloads folder?

So far you have attempted this command in your user folder and in a .minecraft/forge folder

I don't know what happened, but it worked. I have successfully installed forge, the only thing I did was move the installation files to the download folder. As a result, I successfully opened it using cmd.

 

Thank you and all of you

[Installer flashback]

16 minutes ago, DaemonUmbra said:

I'm assuming the installer is in your downloads folder?

So far you have attempted this command in your user folder and in a .minecraft/forge folder

It is not in downloads folder, but I will try again

[Installer flashback]

40 minutes ago, DaemonUmbra said:

Windows is hiding the file extension from you while the command you need to run requires it

If your server does not start or a command window appears and immediately goes away, run the jar manually and provide the output.

 

I tried this and got the data above.

[Installer flashback]

37 minutes ago, DaemonUmbra said:

Windows is hiding the file extension from you while the command you need to run requires it

 

 

I executed this line and the computer output this

（I have made the extension name visible）

 

C:\Users\Simon\AppData\Roaming\.minecraft\forge>java -jar forge-1.14.4-28.1.0-installer (1).jar
Error: Unable to access jarfile forge-1.14.4-28.1.0-installer

C:\Users\Simon\AppData\Roaming\.minecraft\forge>

[Installer flashback]

9 hours ago, diesieben07 said:

https://stackoverflow.com/a/5774976/3638966

C:\Users\Simon>java -jar forge-1.14.4-28.1.0-installer (1).jar
Error: Unable to access jarfile forge-1.14.4-28.1.0-installer

C:\Users\Simon>

[Installer flashback]

26 minutes ago, diesieben07 said:

Thats not how you launch jar files.

What command should I use?

[Installer flashback]

2 hours ago, diesieben07 said:

Run the installer from the command line and post the output.

Microsoft Windows [Version 10.0.18362.418]
(c) 2019 Microsoft Corporation. All rights reserved.

C:\Users\Simon>start C:\"Users"\Simon\AppData\Roaming\.minecraft\forge\forge-1.14.4-28.1.0-installer (1).JAR File
The system cannot find the file C:\Users\Simon\AppData\Roaming\.minecraft\forge\forge-1.14.4-28.1.0-installer.

C:\Users\Simon>
 

 

 

The format should be correct, because I successfully started my steam in the same way. 

[Installer flashback]

 

I downloaded the stable version of forge, but I can't install it. When I try to open it, the computer will show a black window and disappear instantly. I have installed the latest version of java8. Some people say that there is a lack of Environment Variables. I fixed it as directed and passed the "java" test in cmd. However, the problem has not improved, and then I found that I also could not open the Light and Shadow Plugin installation package. The same problem, when you open the program with "java.exe", a black window will appear on the computer (just a flash) and then nothing will happen. Could somebody help me？（I am using win10 64）