Many programs are installed from one installation file that can be downloaded, and hence usually resides in the Downloads folder. This installation file can usually be copied to another computer and be used there.
Running the installation file, usually extracts the program files into more than one folder, sometimes downloads further files into various folders, and writes registry entries. If these are the files you mean (you wrote files), then no. They cannot be transferred to and used in another computer.
Nigel