We regularly publish free AdWords scripts that have worked for us here.
There are several collections of AdWords Scripts online as well as some very famous scripts. Here our link collection about AdWords Scritps:
AdWords Scripts must be updated sometimes when Google made changes in AdWords. This means that suddenly some scripts don't work anymore. That's why we publish our AdWords Scripts in a way that we can update them for you.
If you use scripts from other websites you must update them yourself.