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After testing, I found that the root reason is that Adobe generated an encrypted folder A (Let's call it A). And if you want to install plugin, you need to move it from folder A to folder B.
The move failed because the A folder was encrypted. This in turn causes the plug-in installation to fail.
So how to solve it??????
Sorry to hear about the trouble. Please try the suggestions shared in the below discussions:
Let us know if this helps or if you need any further assistance.