"Many people are updated one by one via ExtensionDistributor, without git. " come on - does anybody ever check what is written?
Topic on Talk:MwExtUpgrader
Not everyone is a native English speaker. Improving it yourself would be nicer and more useful than just complaining.
@Clump I tried to use it with no luck,
Could not open input file: mwExtUpgrader.phar
i managed to run,
with a warning message: Note that this release of code is not stable. Do not use for production.
shall I proceed with it?
It is in beta, so that's a standard kind of notice. I know nothing about this code though. @星耀晨曦 is the author and may be able to offer better advice/help, or you can ask on their github issues page.
For the stability of your wiki and this project has not been widely used, there may be bugs that affect the stability. So before run, the script will prompt you.