Failed to download file error

[KushParmar07]

I just got rift snapshot 0.7.11, but every time i try launching it an error pops up and looks like this
Failed to download file.
Name: mixin-0.7.11-SNAPSHOT.jar
URL: https://www.dimdev.org/maven/org/dimdev/mixin/0.7.11-SNAPSHOT/mixin-0.7.11-SNAPSHOT.jar
Error details: Failed to connect to www.dimdev.org port 443: Timed out
Filename on disk: mixin-0.7.11-SNAPSHOT.jar
Path: C:\Users(private)\AppData\Roaming.minecraft\libraries\org\dimdev\mixin\0.7.11-SNAPSHOT\mixin-0.7.11-SNAPSHOT.jar
Exists: Nonexistent

i don't know what to do, and have tried reinstalling it, and tried the fix on error #83, but it didn't work. Help much apreciated, i want to find wither spawn loacctions!