If you are on a Windows computer that is being prompted for administrator credentials when launching MATLAB, you may not have proper permissions. This issue would typically occur in a professional environment where user accounts are being strictly managed by your IT department.
In order to run MATLAB, you will need Read/Write/Execute permissions within the MATLAB directory. You will need to reach out to your IT department to request the changes to permissions to access MATLAB. It could also be that your computer is being managed by a software such as AppLocker which can block your access to certain software.