Can you undownload software?

SO today i just downloaded the 2007 Mac OSX Leopard software. It is saying that i can't open my itunes because the Itunes library was created by a newer version of iTunes. So therefore i would like to undownload the software and just go back to what i had before because i could use itunes and update my Iphone.

No idea what you are asking about. Please tell us…
-- Type of computer (brand, model, processor type, processor speed).
-- Version of OS before this change.

My answer is for Apple MacBook 2007, OS 10.6.8

"Download" means use a browser to copy a file from an Internet server to your computer's drive. Do you mean "Installed from a DVD"? There are two ways to install OS 10.5 over 10.6…
-- Erase and install.
-- Click the "Options" button in the installer, and choose "Archive and Install".

If you erased, well, you erased that newer version of iTunes. If you now want to have a version of iTunes that came with OS 10.6, you have to install OS 10.6.

If you chose Archive, you will find the newer iTunes at…
/Previous Systems/Applications… But a lot of good it will do. You should just install OS 10.6.

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