Unable to update macOS 10.14.6

I have a MacBook Air 2017. I tried to to do the system update but the internet went out. Its' now stuck at 817.6 mb of 2.64 gb and keeps saying "The Requested Time Out". It will not go any further than that. I also get the little gray box that pops up that says "Some of the update was unable to download" or something close to that effect. What do I do? I tried a forced power off to retry...... and nothing.