I came accross Could not access network location APPDATA errors in ccmsetup.log during a SCCM 2012 client installation.
The installation is stuck with those MSI error logs in ccmsetup.log and will retry in 120 minutes.
The environmental variable %APPDATA% is required during the SCCM client installation and fail to access. AppData folder contains application settings, files, and data specific to the apps on your PC.
Open registry and navigate to HKEY_USERS\S-1-5-18\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders
Change AppData value to %USERPROFILE%\AppData\Roaming
The installation will resume in the next 120 minutes.