Fully agree with Rodrigo's comment.
I tried to install on Windows machine using Lazarus 1.5, prerelease compiling with FPC 3.1.1 and it wont build
Version 1.2 (formerly only this was downloadable here) is outdated and breaks many apps. Since it uses components which don't compile in fp 3.0+ one must use fp 2.6.4 The real version is fpGUI 1.4.1+ from github only (by now it is downable here, too). This sf project should be deleted in favour of the newer github project with the same name. Be aware that fpGUI turns your Lazarus RAD into a SAD. Kiss your form-designer goodbye ! When using uidesigner (fpGUI replacement of the Lazarus form-designer), you have to find and type all uses-clauses manually (on second use of the same widget type it of course won't be necessary). So you may want have a complete "uses A-Z" line ready to save that bother. uidesigner does widget layout etc., i.e. you can resize a TfpgMemo and change it's Text-Property asf.. If you prefer SAD over RAD you may opt on this. The project main idea probably is to have all run-time code in a single binary with no libraries to load at run-time. This sure comes at a price. PS: The version 1.2 problem is mitigated by now. You find ver. 1.4.1+ right here on SF , too, on top of github.