The link to TreeAge is here -
TreeAge distribution, it's about 240Kb. When the download is complete unzip the file in a new directory, that's all you need to do to install. Your registry settings are not changed by the install, in fact no files are altered, you just get the contents of the zip file.
To execute the program double click or "open" the file "TreeAge.exe", and take it from there, the program is fairly self explanatory. In this distribution help is defaulted to on so you get a second box with comments on what the program is doing / what you need to do. All items that you have to enter to get a Tree's Age can have default settings, these currently are set to refer to Brickfields Park, but they can be changed in the "Trees.dat" file. So if you have say, 50 Beech trees to do in the same place on the same day, you can edit the Trees.dat file, so that you don't have to enter these fields each time.
TreeAge is a work in progress, please feel free to send in requests / errors / bugs. Print and Database functions will be completed upon feedback fom users as to what they would like to see.