When upgrading the Handy Address Book Server from an older version just install the new
version right over the old one. Do not uninstall the old version first.
If you are upgrading from a version prior to 4.0 please note that there is an
upgrade fee required for the 4.x versions. See:
Upgrade Pricing. Once you have upgraded
to 4.x, your new license key will be valid in all 4.x versions.
The 4.x versions use a new file format as compared to the 1.x, 2.x, and 3.x
versions. Any data files from older versions will automatically be
converted when using the 4.x versions.