Hi Maciej:
Sorry it took so long, as I have been away.
If you copy all of the script as text, and then paste it into a new document, say with Leafpad then save as InstallO.sh. Now you have the script in a file format. Next you will have to change the file to executable by using the line that I put into the message on the forum, starts like this: chgmod…..

Next put the file into a folder that you have created, name it anything you want as long as there are no spaces in the name.
Then execute the file in the terminal using these commands:
cd /whatever/the/folder/path/is
./InstallO.sh

Good luck,
Freddie