...
If you don’t have the option mentioned in the above lines, please follow these steps:
Previous steps
Go to Plugins → Installed plugins.
Deactivate the SeQura checkout plugin.
Delete the SeQura checkout plugin.
Steps to update
Download the most recent version you can find in this link.
Go to Plugins → Add new plugin → Upload plugin.
Select the file woocommerce-sequracheckout.zip and click on Install now.
Click on Activate plugin.
...