I'm afraid you can't. Here is why:
1. LinkSeam Agency is only an up-sell or upgrade of LinkSeam Lite and LinkSeam Premium which adds Agency features in your LinkSeam app.
2. Since LinkSeam Agency only an up-sell or upgrade you must have LinkSeam Lite or LinkSeam Premium in your account first in order to buy LinkSeam Agency.
3. Even if you buy LinkSeam Agency without buying LinkSeam Lite or LinkSeam Premium you wouldn't be able to use LinkSeam because LinkSeam Agency is depended on the standard product. So, with only LinkSeam Agency you wouldn't be able to login.
Note: In case you bought LinkSeam Agency without buying LinkSeam Lite or LinkSeam Premium consider buying the standard/main product from our sales page here: https://salesp.getlinkseam.com/fe/