Yes, we provide free updates to our connector. We are constantly working on adding new features, and you can take advantage of those via free upgrades.
You can install our connector on each of your BigCommerce stores and connect it to the same Akeneo PIM instance. You can configure the connector to sync the relevant products for each store. There is a connector cost per store.
Yes, free support and upgrades are included with the connector. We will keep the connector compatible with all upcoming Akeneo PIM and BigCommerce releases. We will also be adding additional features that will be provided for free.