October's Development License Does Not Permit WindowViewer

I have a Virtual Machine with System Platform 2023.  In LocalLicensePool there are licences for this year for May, Aug, Sep.  Each time I've copied in the licence and everything is fine.  Now I have copied in October's licence, Advstd 46 Pl231 31 Oct 2024.loc, but WindowViewer won't run.

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WindowViewer
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License: Failed to retrieve information from the FS A2 Development license. Either the FS A2 Development license is not available or it has expired.
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OK   
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System Platform IDE runs with the new licence.  It had stopped working witht he Sep licence.  Why won't WindowViewer run?

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