• A new in app document should be added explaning how to install an local extension
• The setup guide should link to the above document and some short "if the chrome store isnt accessible read about how to "
• The "save" button of the "export chrome extension" UI function should give feedback that it has saved the extension and where it is saved to or if it failed.
• The client can also check if the chrome store is blocked and in that case hide the link to it in the setup guide. (if development time allows, postpone otherwise)

documentation

This is a good base for a a text explaing how to install a local extension:

https://developer.chrome.com/extensions/getstarted#unpacked

The case might be that a user also have successfully installed from the chrome
store earlier and if the user then installs a local version.. Our text should
mention how to identify which is which and disable one of them.