I downloaded the LibreLinkUp app before receiving the connection invitation email from the FreeStyle Libre app user. Can I still connect with the FreeStyle Libre app user?
Yes. If you downloaded the LibreLinkUp app on your smartphone, you will see a pop-up message asking whether you would like to accept the invitation the next time you open the app. Tap Allow to confirm the connection.1
Reference
1. FreeStyle LibreLinkUp caregiver user guide.