There is a .exe created after installation which also launches the game. That’s why i was asking.
You could try to clear your Battle.Net cache to see if it resolves the issue. Here is the link from the Battle.Net Support:
https://eu.battle.net/support/en/article/34721?utm_source=Internal-TechForum&utm_medium=Posting&utm_campaign=BlizzardCS&utm_content=solution