Error 404 with forge MDK installation

[Lokege Bear]

Hi

i've a problm with the forge mdk installation. When i'm using this command "gradlew setupDecompWorkspace", i've an 404 error. So, the librairies are not downloaded. And when i opened eclipse, i've 8 errors.
What can i do? I already modify the gradle.build but i still have the same error. I use Java 8 Update 291. And I don't want to migrate to new version, I want to use 1.9.4 or 1.8.9.