I've upgraded or changed themes. How do I reinstall Sticky Buy Now Button?
Sticky Buy Now Button does not modify your theme, and so no steps should be needed when you upgrade or change themes.
If the bar does not appear after upgrading or changing themes, it's likely your account settings will need to be updated to be compatible with your theme.
Please contact support for assistance with this, or, if you have HTML / CSS experience, feel free to try adjusting the selectors in the Advanced Settings section of the app.