Okay i foudn the reason why it didnt work.
I realised, that it worked after the pc was laoding teh autostart programms. IU then closed them 1 after another and MSI Afterburner caused that Issue.
What on earth.
No
Its a problem with my pc and not forge itself, but its forge i want to install so.
And the .jar is definitely working someone else tried it. I send it to him with Discord.
I provided it. Its the same as what is written in the cmd screen, but when you want. forge-1.14.3-27.0.60-installer.jar.log
I now started that installer with admin right. (didn't work)
made a sfc /scannow.
reinstalled several times. used different locations on the harddrive. made a antivirus exception