Easy Digital Downloads already supports tax for non-EU countries. Our Easy Digital Downloads EU VAT plugin extends this by adding support for European VAT, plus the UK. You can use it alongside charging tax for other non-EU countries - simply add the required tax rates in the Easy Digital Downloads tax settings.
The correct VAT will be charged for all EU countries, and doesn't affect any additional countries that you have added tax rates for (e.g. Russia or New Zealand).
Since the UK was part of the EU until recently, the plugin fully supports UK VAT. This includes automatically charging the correct rate of UK VAT, allowing customers with a UK VAT number to have their VAT reverse charged, and displaying your store's UK VAT number alongside your EU VAT number on invoices.
we have continued supporting UK VAT in the plugin wherever possible.