What should I do if a PDF automatically closes after opening?

Cause analysis:

It may be that the Adobe FLEXnet Licensing service has not been started.

Solution:

1. Open the service management console.

Press the WIN R key combination to open the run window, enter services.msc, and click OK

2. Find the service FLEXnet Licensing Service and change the startup type to Manually, and enable this service.

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