We had to delay recommending Catalina due to incompatibility with widely used scientific software (SPSS, MathType), and our on premises backup solution (IBM Spectrum Protect), all of which took more than 90 days to reach compatibility. This pattern was not unique to Catalina and I would be surprised if it is any different with Big Sur. If our long-time users of software such as SPSS lost access due to enforced updates, they would have no option but to switch to an operating system that offered more granular control (Windows or Linux).
grahamrpugh
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Thank you @rtrouton for asking about the VPP redownload error. I'm still not 100% sure if that is the same error that means VPP-distributed apps never get updated, but I hope this raises awareness.