It sounds like you are using academic/commercial versions, which requires licenses hosted on ANSYS License Manager.
You can try using the free student packages from here
This doesn't need any licensing because the license file is already included with the installation package and is placed in the correct directory (default)
C:Program FilesANSYS IncANSYS StudentShared FilesLicensingstudent.lic
This does not need ANSYS License Manager to host it.
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