I wonder if there is existing mature solution for resource update on PC?

As a MMO, resource update is prerequisite.
The size of a MMO on PC may reach 300MB. Unity’s AssetBundle can export static resource file, it doesn’t support incremental updating. Is there mature solution for resource update on PC existing?
Tell me how please, if so.

With unity pro you can load asset bundles from remote webservers, this may help solve your problem.