OK, I've done that, uninstalled the Stripe extension, then reinstalled it. It still says it's version 1.0.1, but I did replace all the files. Why is it not showing as the updated version 1.0.2? Is it or is it not updated? Does something else in the installation need to be updated to work with it?
Now I'm showing a different error on the checkout page: Secure connection cannot be established! What causes this error?
More precisely, what is making Abantecart unable to establish a secure connection with Stripe? It used to work fine.
And since I have Paypal working - for now - is there a way to turn off the "Checkout" button on the cart page so that only the Paypal button is visible? Customers can pay with Paypal, the checkout button is a dead end until Stripe is fixed.