Yes, the upgrades are available in our online store.
Please note that when you crossgrade, you lose the license you're crossgrading from. For example:
If you crossgrade from LM2 to LM2n, you lose the LM2 license.
As such, if you expect you will need to keep your old license, we recommend you don't crossgrade but instead purchase a new full license in addition to the one you already have.