r0d3nt

Sorry for the double post, but it worked! It opened like how it was supposed to after double clicking. Will I have to do this for every version of forge I want to install?

Oh you're right, I didn't notice. I tried the command after switching out the launcher for installer, and this is what I got edit: just noticed it's the wrong installer version, I'll try again with the right one

Here's the jar file in user\kevin.

I don't think I'm getting it right yet, my apologies. I don't really go near this stuff very often so I'm not sure how it's supposed to look. Either of these help? I moved the forge installer to users\kevin, and theres ones on the desktop,

The command i was using was 'java -Djava.io.tmpdir=desktop -jar forge-1.15.2-31.2.0-installer.jar' But it didn't work even though my file is on the desktop? I tried moving it to a folder on the desktop, and to a folder in my %appdata% > '.minecraft' folder and it had the same outcome. Is the command not typed right? edit: I tried with 'java -Djava.io.tmpdir=%appdata^>.minecraft>mods -jar forge-1.15.2-31.2.0-installer.jar' and it said access denied.

So what do I change in order for it to work?

Aaah im sorry haha you're being extremely patient with me. My forge installer is just on my desktop if that's what you're meaning edit: I think I understand you- my bad. I'm not sure where my temp is located

The same thing happened after i added .jar at the end. I'm not sure what the extension is if not .jar? It says in file explorer 'Executable jar file' what would I type for that?

I'm not sure if I did it correctly, but this came up:

So this is reinstalling java?? sorry, im a tad confused. where should the temp directory be?

The error is gone now, but nothing's opening still.

Just tried, it had the same result. After right clicking to 'open with' there were two SE options, one did nothing and one opened a confirmation, then the same error. Heres the notepad file it created, if its any help.

Ah I see. My dad built this computer since I'm not very good with stuff like this. I've reinstalled it, should I retry opening forge?

Just tried an older version of forge (1.14.4) and it does the same thing. Doesn't open by double clicking, gives me an error with SE.