Access to a Figma extension that I previously published

[Gleb]

How do I download the plugin I have posted?

The only things uploaded to Figma are the manifest and the JS/HTML files listed in it. If you didn’t directly write js and html code but instead compiled them from multiple files, there is no way to get these source files as Figma never even sees them in the first place. It only sees the files at paths specified in the manifest and source code is not a part of it.