Add the following to Website > Pages > Website Tools > Code Injection > HEADER.
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.7.1/jquery.min.js"></script>
Add code from file change variant unavailable alert for product blocks.html to Store Settings > Advanced > Page Header Code Injection for the store page.
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2021-05-13
- made code a litte more generic and minor clean up
- added no MutationObserver guard
- bumped version to 0.1d2
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2020-12-21
- initial version