Hi faustino68,
welcome to the Apple (user-to-user) Community.
Re: "want to download an album i bought dosent show up on my purchase or on my music
cant download it said purchased what can i du"
Wondering which Mac or device model you use, and which MacOS, iOS etc. version is installed.
If you haven't already: You could try searching the Library for that music.
Eg: for iPhone: View albums, playlists, and more in Music on iPhone - Apple Support
says:
✽ In the Music app, tap Library, then tap a category, such as Albums or Songs; tap Downloaded to view only music stored on iPhone.
✽ Scroll to browse or swipe down the page and type in the search field to filter your results and find what you’re looking for.
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Else:
View your purchase history for the App Store, iTunes Store, and other Apple media services - Apple Support
and
Apple support have an article online that may help: eg: previous purchases can generally be RE-downloaded.
How to: Redownload music - Apple Support
or
If there's an issue when you redownload apps, movies, or other content from Apple - Apple Support
or
Check that the music has not been accidentally hidden:
Hide and unhide music, movies, TV shows, audiobooks, and books - Apple Support
If needed:
Apple Music Support website: (info / support / contact):
Music - Official Apple Support
All the best :-)