How to manually un-install using backup versions

if you need to remove the app manually start here.

Then select product-template.liquid from the side menu

click “Older version”

and select an older version, if you’ve installed other apps or made any other changes to this file you’ll need to consider his when choosing which backup to reinstate, as a rule don’t go back further than you really need to.

check that the older file contains 

{{ product.description }}

and click ‘Save’

you can then delete the otabs snippet file, found in the “snippets” section

otabs.liquid