For those that want to play it in English, download this mod, copy the contents over to the folder \FDD\ in the root directory of the game (default directory should be C:\GOG Games\Kajko i Kokosz\FDD\) and load the file KIK.EXE from the folder \FDD\ with DOSBox.

The CD version seems to crash even without the mod, so I couldn't check it with the mod.

And the FDD version has that old password DRM some DOS games had. To get the passwords, you need to get them from the manual, which is available here.

Thanks for this just brought it though I did it slightly differently I just copied the mod to the main directory, I didn't move any files from the FDD folder, and both CD and FDD versions seem to work fine with the mod.

Though yes the FDD version as a password DRM you will need the manual, so thanks for the link.

Also the CD version has voices they are in Polish though so press T in game to turn on subtitles as well subtitles will be in English. Menus have translation as well as items like doors etc. Also in game its F10 to bring up the menu to save load or quit or F2 for save menu and F3 for load.

Thanks for the detailed explanation!

About the CD version, I tried it again in another system, and now it does work for me.
Probably something I was doing in the previous system was causing problems.