when you try to install an application on the PC, the computer gives error 81, what can I do?

1) Quit the Creative Cloud desktop app from the gear icon in the upper-right corner.

2) Browse to the following location based on your operating system.

    A) Mac OS:

/Users/<user folder>/Library/Application Support/Adobe/OOBE/PDApp

        Note: The \Users\<user folder>\Library\ is hidden by default after 10.7. google enable access to hidden user library files | Mac OS 10.7 and later for instructions on accessing it or check https://helpx.adobe.com/creative-cloud/kb/unknown-server-error-launching-cc.html.

    B) Windows:

C:\Users\<user folder>\AppData\Local\Adobe\OOBE\PDApp

Windows 64-bit: \Program Files (x86)\Common Files\Adobe\OOBE\PDApp

Windows 32-bit: \Program Files\Common Files\Adobe\OOBE\PDApp

        Note: The AppData is hidden with Windows default settings. google Show hidden files, folders, filename extensions | Windows for instructions to show it or check https://helpx.adobe.com/creative-cloud/kb/unknown-server-error-launching-cc.html.