Upgrading Umbraco

1. Download the zip file of your desired version.
2. Follow the instructions to upgrade the Umbraco web project.

The way to merge two files:

1. Use file explorer to have two windows open: one shows the contents of the current Umbraco web app's folder and one shows the unzipped folder of the new version.
2. Open both the current version and the new version of a file with Visual Studio Code.
3. Copy the new version to the clipboard.
4. Select the current version, right-click > Compare text with Clipboard, find the differences and make necessary changes. 

It takes about 20-30 minutes to go over all the files that need to be merged. The entire upgrading process takes about half an hour.