Hello and welcome to Amiga.
Some of the programs do not need to be installed at all and run just fine from any directory. Some of the programs need to be installed manually (according to their readme or guide files). And finally, there are programs provided with an installer.
There are two possibilities how to launch the Amiga programs:
1) by double-clicking the program icon (this method is called "calling programs from Workbench").
2) by typing the program name into AmigaDOS window
("calling from Shell")
If you open any drawer in AmiKit, the button number 2 (as shown here
) switches between these two modes.
If you are in Icon mode
or Icon Action Mode
(contains the toolbar on top of the window), you see graphical icons. Only files with icons are displayed (eg. "PhaseOne!.info" file is the icon of "PhaseOne!" executable file). Double-click the icon to launch the appropriate program.
Or use the button number 2 (or press the right mouse over the window bar
) to switch the view to Name mode
. Any item double-clicked through this Name mode will be executed as it was typed in AmigaDOS.
So, if you was in Name mode and you double-clicked the installer file, the file was opened in editor because the file is a text actually. However this file has an icon (named eg. installer.info) which contains additional information on how to run the file itself. To run the installer correctly, simply switch to Icon mode and double-click its icon.
You might also want to look at the Tutorial Videos