Installing the KOL library is as follows. First you need to create an empty folder. For example, let it be "C: \ KOL". And then unpack the contents of the KOL.zip archive into it. No other action is required. KOL is not a set of components for working in VCL, but a set of units that are included in a project by writing a reference to the unit used in the uses section of your unit or project. You just need to remember to write the path to the directory where the module is located in the project options (Project | Options | Directories / Conditionals | Search paths ...) or in the development environment options (Tools | Environment options ... | Library | Library paths).