i need to install the code for an extension developed by an ex coworker that left the company. so now it is impossible to get the source code from him/her
As has been replied, if the original extension's app.json file blocks downloading the source code, there is extremely limited exposure and visibility into it. As outlined here Microsoft Learn. The one person who replied about including the extension as a dependency isn't really a solution. You might be able to download the .app file as a symbol. But if you open it like a ZIP file you still won't be able to view the actual source code,
If this extension was developed on behalf of a commercial organization, I would highly recommend leveraging Azure DevOps or Github to avoid running into such challenges in the future!
if you don't have the Source Code, the App Package, and the app allowDownloadingSource property has been set to false, I don't think you have any other way to get the source.
Your best chance is to contact the ex-coworker to get the source (assuming he/she still has the code).
You can add that extension into your app.json files to get that extension and the code.
Here's the screenshot about how to add extension in app.json file.
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