Was able to start 'ct2laz.exe' with 'Replacements.csv'.
Please explain more about the 'settings'.
First line: Download / Extract / Project.
Then a list from 1) to 6) and maybe more, but not visible.
Which checkboxes should I activate (all)?
No, not all. For converting CT projects settings should be as in the attached screenshot. You need all checkboxes only when you want to download original CT components and demos and want to convert them by your self to be used in Lazarus. However, that's what ct4laz does, so you need it only in special cases.
I don't get an "lpr" but a "pas" !!!
ctpr is converted to lpi (other replaced extensions can be set in edit fields under checkbox number 7), and lpi can be opened in Lazarus. That's the way it should be, so there is no conversion bug found in my tests of your CT project. To be able to open the project in Lazarus, you need to first install all needed packages. Keep in mind that although conversion is automated, sometimes manual work is needed.