Newer WP Version Not Working

I am in the process of building our new eCommerce site and your plug in is about the only one that looks to work for what we are looking for but when i try and install it it gives me an error and brings the whole site down and i have to manually remove the plugin.

can we get an update for this to work on 5.4 wordpress. We are a 8 store electronic recycler that has multiple warehouses we want to be able to ship from according to the geolocation. I would love to work with you on getting this going asap.

Please let us know what we can do to help get this going.