You might want to check the Muse forum. And as far as online shops go my advise has been for years to simply rent a pre-configured shop from a big hosting provider.
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Tech support for Muse will continue until the end of March 2020. And Muse won't stop working until or unless the browsers adopt newer web standards that render Muse generated code obsolete which probably won't happen for several more years.
Muse and Business Catalyst alternatives are being discussed and compared at length in the product forums.
See the Google Sheet.
- Muse users thinking about using Dreamweaver.
- MUSE Alternatives
- Muse Alternatives
- List of Possible Alternatives for Muse
- Re: Adobe Muse EOL announcement - Alternatives to Adobe Muse?
As I see it, Musers have 3 options.
1) Keep using Muse.
2) Commit to learning code basics & working with native HTML, CSS & JS files.
3) Start over with another web design tool.
If the site isn't responsive & supporting retina-ready images, it needs a rebuild anyway.