Extract the archive using 7-Zip or WinRAR. Then:
Pro tip: Before attempting the Intouro download, ensure you have at least one Mercedes Citaro mod installed (preferably the official Steam DLC). Without it, the Intouro will spawn without sound or with a blank dashboard. Mercedes Intouro Omsi 2 Download
"OMSI 2 Mercedes Intouro Perotinus download" (Perotinus made one of the most detailed freeware Intouro K versions.) Extract the archive using 7-Zip or WinRAR
(often found as part of the "O560" series) or the recent dedicated paid/freeware mods found on community hubs like OMSI WebDisk Mercedes Intouro Omsi 2 Download