To improve security, we will soon start forcing password resets for any account that uses a weak password on the next login. If you have a weak password or a defunct email, please update it now to prevent future disruption.
If the iso is mounted then you can directly access its content in file explorer. Open the disk with the iso image and try to find some .exe file to start installation.
In other words if installation doesn't pop up automatically then you have to initiate it manually.