Problem with installation

Hello my name is Tereza. I´m from Czech Republic. We have close our school, because of covid19. Discard is tool how I can see my friends and teachers.I tryied to install Discard on my PC, unfortunately I wrote wrong year of my birth. On-line version is OK. But I can´t fix the installation. Would you be so kind and help me? My account on Discord is Tereza Osvaldová. My e-mail is Tereza.Osvaldova@protonmail.com. Thank you. Tereza