The link for the 2015 VAT moss regulations for the EU in the pop-up when purchasing that says :
"Due to 2015 VAT MOSS regulations for the EU this seller requires evidence of buyer location for purchases. Please provide your billing address to continue." goes to an invalid link. 
This is the link it tries to go to: https://taxation-customs.ec.europa.eu/taxation/vat/how_vat_works/telecom/index_en.htm