It is. I had it, it (according to parental one) slowed down the computer, so we uninstalled it. Didn't use it for much, might be able to reinstall it. How much is FM on Steam? I remember looking once and forgetting.
If Carson won't feature in your plans then sell as that's a good bit of money for a lower league club, assuming you have a good % of transfer revenue that you can then reinvest. If it's like 20% don't bother.