How to use updater.bat

This only will work if you have download the repository with GIT, if you downloaded the .zip you will have to delete the folder and download it again through GIT, see step 2.
Download and install the last GIT version
Open the file updater.bat with any text editor
Change the C:\Program Files\Git\cmd for the path that you are installed, you don't usually need to change it, but make sure it is installed in the same path as it is in the file.
It is important that the path you enter is the same as the one with the git.exe file as shown in the image.
In updater.bat we have 2 source options, most of the time there will be no difference between them, if in doubt, choose option 1.

How to Download repository through GIT

Like above, you need GIT installed and make sure it is installed in the same path as it is in the file downloader.bat.
If you already download AzurLaneAutoScript-master.zip, just extract and double-click in downloader.bat, then the repository will be cloned again, but now the .git folder will be created.
If you haven't downloaded the .zip, just download the downloader.bat file, created a folder where you want ALAS to be downloaded, put downloader.bat inside that folder and click.

If you do it right, you will have a similar result, so only what has been changed will be downloaded again.