Using current catalogs on older versions of Classic?

[magicgenie]

My Cat is a latest version unfortunately, but i need to transfer to my colleague who is using an older imac that cannot upgrade to an OS that will enable use of 12 Cats. Is there a solution for my colleague to use this cat, anything i can do?

[AxelMatt]

There is no downgrade option for catalog files into an older version. 

You can save xmp back to the files and import into a catalog which can be opened in the appropriate LR version.

[Bob Somrak]

As @AxelMatt said you can save xmp to the files and import to the other computer BUT any editing functionallity that are not available in the older versions will not show up.