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Error code P81: Another installer instance is running
Error code P81 indicates that another installation might be running in the background.
Solution
Wait for the other installation to finish, and then try again.
I will try and try again, But time remaining is very slowly and I use internet download speed to 52.79 Mb/s. Time remaining show 120 minutes left
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Are you trying to install the Document Cloud SDK? If not, what are you trying to install?