Yes i wasn't also able to then i saw that in file name there is space between Virtual and Cottage so i renamed the file from "Virtual Cottage_LINUX.x86_64" to "VirtualCottage_LINUX.x86_64"(removed the spaces between them). After that i also removed the spaces between the filename with extension .pck (did the same as above) , it was "Virtual Cottage_LINUX.pck" now it is "VirtualCottage_LINUX.pck" and then run this code by terminal - -
sudo chmod +x VirtualCottage_LINUX.x86_64
That's it now you can start it!