The only 1.8 version you can get now is 1.8.9 which is here
Why do you need 1.8.0? If you have to install a 1.8 , use 1.8.9
If you have a question about a Moodle 1.8.0, please ask in one of the forums and people will try to help
Installing and upgrading help
moodle v1.8.0
This discussion has been locked so you can no longer reply to it.