Hey Bernard,
Thanks for reaching out to us!
We always recommend using the latest version of WordPress as well as WooCommerce when working in general. The same when working with our plugins. We update them to ensure continued functionality with the latest versions of all necessary plugins and core.
In this process, we don’t test to ensure that older versions of other plugins continue to be compatible. So, the best approach is to build/setup in a way that you can guarantee continual updates for all plugins.
We don’t have any specific testing or review for the Zapier add-on for WooCommerce. The best thing to do for these types of things is to just try it out. If it doesn’t work after testing, we’re happy to give you a refund for any purchases within 30 days of original purchase.
Let me know if this helps.
Thanks!