There may be a few countries in which AdBlock VPN may encounter installation, payment, or performance issues. These include the embargoed countries of Cuba, Iran, North Korea, Sudan, Syria, and Crimea region of Ukraine (under Russian occupation). Additionally, while it should be possible to install and pay for AdBlock VPN in China, there may be occasional issues with performance. 

We are happy to offer a full refund within 30 days of purchase if you encounter any issues while using AdBlock VPN in any of these countries.