It is possible to automatically install and update AutoIntegrate script by adding it to the PixInsight update repository. Whenever PixInsight is started it will then check for updates to AutoIntegate.js. To enable automatic updates you need to add the following Url to the PixInsight Resources/Updates/Manage Repositories.
https://ruuth.xyz/autointegrate
AutoIntegrate is added to the Script/Batch Processing menu.