Yes, IP Blocker Pro Software provides two methods to resolve your issue.
Method 1: If you want to disable all viewers except few IP addresses, then you can use Personal Network Viewer to block all traffic except your defined IP Addresses.
Method 2: If you want to allow some countries apart from Country A, then you can block the countries your want and exclude your defined IP Addresses. Then the blocked countries will not be able to go-through your site but the UN-BLOCKED countries and excluded IP Addresses will be able to visit.
Regarding your licensing query: Currently we provide standardized licenses available for 1 Site, 2 Sites, 5 Sites, and Unlimited Sites. However, in order to fulfil the custom 6 license requirements, you can purchase two types of licenses
5 Sites License and
1 Sites License