We do charge an upgrade fee for major upgrades (such as the upgrade from 2.x to 3.0 or to 3.5). In general, a major upgrade is one in which the first digit of the version number changes.
HyperRESEARCH 3.0 introduced tiered pricing (bringing our software in line with our competitors' pricing structures while remaining at a much lower cost). HyperRESEARCH 3.5 revises those costs, introducing the Government/Nonprofit pricing tier and offering volume discounts when purchasing as few as 2 copies of our software.
The cost to purchase an upgrade or a full copy will thus depend on your status as a Commercial purchaser, a Government / Nonprofit purchaser, and Educational purchaser, or a student.