Welcome to Orchid Board. It's a bit hard to tell from the picture if the roots are alive or dead. They appear white which often means they are alive. But if they feel firm ad not mushy or hollow, they will be alive. The roots are usually white when dry and turn green when wet, much like Phal roots do. I would soak the roots and see which ones plum up and turn green. They can be stained brownish from bark or other medias, and if firm, keep them. Remove any mushy or hollow ones. If you have some seaweed, I would soak them in that for an hour before re-potting. Repot in an open chunky media. I prefer straight medium bark for all my Catts, but it depends on your watering habits and growing conditions as to what will be best for you. Soak the bark first as it will be very dry and not hold much moisture when new. Catts should get good air to the roots and pots should have enough holes to provide very good drainage. They should completely dry out before watering except maybe in the very hottest days of summer, then water when almost dry.
Normally I would never re-pot a Catt (or most other orchids) until I see new root growth started. But with newly acquired ones, it is important to check the roots and get into an appropriate media and pot.
If it is unstable after potting, stake it so that it doesn't move around. This will help it get established much faster. Also don't over pot as it is hard to get the media evenly dried in the centre if the pot is much larger than the root ball and this causes root rot.
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