If you have installed the STUDENT version from the ANSYS site (https://www.ansys.com/academic/free-student-products) then you do NOT need to install a license file or the license manager. The license file is built in with the Student product and no action for licensing is needed.
Installation steps for the ANSYS Student products from Release 18.0 onward:
Extract (unzip) the downloaded installation files.
Right-click on setup and select Run as Administrator.
Read and accept to continue.
Click the right arrow button to accept the default values throughout the installation.
Click the exit button to close the installer.
The ANSYS Student software is now installed. Congratulations!
I suggest you Uninstall and delete your directory and then reinstall as above.