Does wyBuild support stand alone offline update?

Is it possible to build a stand alone patch update without using network or internet?

I mean can I do the update patch with containing update files in the patch itself without updating and uploading to server?

Yes, by using the 2 wyUpdate commandline options -server="<url>" and optionally -updatepath="<url>" you can install updates from the local disk.

We're adding easier "offline patch" abilities to 2.7.x.