In Many tutorial no more capx for download. Ever error 404, files not found!
Some links would be of help here.
Tutorials allow a .capx to be attached but some authors choose to use their own hosting. If it is such a tutorial, then contacting the author may help or if you give us a link, a user may still have the original and be able to upload for you.
Please start by telling us which tutorial(s) you are referring to.
If you are referring to example files, then the hosting may have elapsed over time, so check when they were posted and when the author last visited - by looking at their profile.