A license lets you run one instance of an application at a time. The license is bound to one person and can only be active on an unique computer at a time.
The license can be activated offline using activation code.
A single (non-business) license have a “Home Use” rule which allows it to be installed and activated on two computers (such as a desktop and laptop or a work computer and home machine), provided that both copies aren’t actually run at the same time.
Single license is suitable for Win 64bit and Linux 64bit version. Just use one of them at a time.
Guaranteed Money Back
Whatever the reason, money-back is guaranteed within 30 days. The time of refunding vary depending on your payment method.