Continuing the discussion from Profile problem:
EDIT:
It seems Forge cant decide what format their download URL should have.
for 1.7.10 and 1.9.* it is /version - release - version/
for 1.8.* it is /version - release/
See the following example URLS from Forge :
1.7.10 download link:
http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.7.10-10.13.4.1614-1.7.10/forge-1.7.10-10.13.4.1614-1.7.10-installer.jar
1.8.9 download link:
http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.8.9-11.15.1.1855/forge-1.8.9-11.15.1.1855-installer.jar
1.9 download link:
http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.9-12.16.0.1853-1.9/forge-1.9-12.16.0.1853-1.9-installer.jar
Old Post:
It seems Forge have changed their urls between Forge 1.8.9 and 1.9:
1.8.9 download link:
http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.8.9-11.15.1.1855/forge-1.8.9-11.15.1.1855-installer.jar
1.9 download link:
http://files.minecraftforge.net/maven/net/minecraftforge/forge/1.9-12.16.0.1853-1.9/forge-1.9-12.16.0.1853-1.9-installer.jar
It looks to me like they have added the version number again after the release number:
/1.8.9-11.15.1.1855/ vs /1.9-12.16.0.1853-1.9/
I have no idea if this is intentional and here to stay, or just temporarily, but it means that MineOS is not able to download the 1.9 jar.