Major upgrades are subject to a fee .
You recognize the type of upgrade at first digit of version number. If the first number has changed, this is a Major upgrade, if unchanged it is a minor upgrade. When the third section of the version is changed, this is a different build number generally and it means that some small bugs was corrected. A change from v3.1.10 to v3.1.20 is a technical update or new build. We offer the electronic upgrade FREE to all NEC4WIN95 registered users .