We literally just bought the LIt extension and were having issues.
Opened a ticket and they provided a newer plugin they just finished.
Luckily we are doing an import from magento only so we could clear all products before starting the import.
Got all the products imported.
Now having issues with configurable products with only some of the items available showing..
If i remember correctly when i bought the plugin it came with one free year of support so if you are in that range i would suggest opening a ticket. I'll update this post once i'm done with the ticket.
Facing same issue on my Magento Ecommerce website. Thanks God, I have found the topic related to my issue.