PROBLEM
When attempting to upgrade ArcGIS Pro using an executable file, the upgrade fails, and returns the following Windows error messages:
Error: The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2502.
Error: The installer has encountered an unexpected error installing this package. This may indicate a problem with this package. The error code is 2503.
The Windows user account performing the upgrade does not have full permission to the Windows Temp folder.
To resolve the issue, grant the Windows user account the necessary permissions to read and write data in the Windows Temp folder.
Note: The following workaround may require administrative rights. Consult the organization's IT department for assistance.
Note: If the Windows user account is present in the Group or user names list, proceed to Step 8.
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