Does this Bookshop theme support Magento 2?
We have UB Bookshop for Magento 2 available here (the version you used was Bookshop theme for Magento 1). These are actually two different themes.
Please note that all extensions built in our Magento 2 themes will need separated purchase.
PS. We have a bundle option in case you consider to purchase all our Magento 2 extensions built in the theme.