Configuration Manager Ccmsetup Error Exit Code 1603 MSI Could not Access Network Location %APPDATA%.

From CCMSETUP.Log:

Action: CostFinalize. Computing space requirements
Could not access network location %APPDATA%\.
Could not access network location %APPDATA%\.

While installing sccm client, it requires to access the environmental variable %APPDATA% from the registry location which is corrupted/Changed for several reasons.

Here is the fix:

1. Open the Registry Editor (Win+R and then regedit);
2. Navigate to the following registry keys HKEY_USERS\.DEFAULT\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders

3. The correct and default value for AppData should be %USERPROFILE%\AppData\Roaming

4. It would be better to also check and correct the AppData Value for the below registry keys as well before we start the installation.

• HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\
• HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders\