Having install issues, the Adobe Exchange site has instructions if the auto-install from the website doesn't work. They list three tools you could use. Our experience, and feedback from a number of users is Anastasiy's Extension Manager works most successfully.
- When downloaded, the file name is ArcGIS®_Maps_for_Adobe®_Creative_Cloud®_1.2.0.zxp. It maybe require to renamed/removed the "®" characters to ensure a successful install.
- Note that you may need IT support as Anastasiy's Extension Manager requires an administrator password to be installed.