Error:
File C:\Windows\ccmsetup\{4D87A80B-6971-43EF-A59F-8088D214378A}\client.msi installation failed. Error text: ExitCode: 1603
Action: CostFinalize.
ErrorMessages:
Could not access network location %APPDATA%\.
Could not access network location %APPDATA%\.
Solution :
Change the "AppData" value for the LocalSystem account in registry to – “%USERPROFILE%\AppData\Roaming”
The LocalSystem account can be found at: [HKEY_USERS\S-1-5-18\]
The entry located here:
[HKEY_USERS\S-1-5-18\Software\Microsoft\Windows\CurrentVersion\Explorer\User Shell Folders]
Befor:
After:
This solution applies also for the 1606 error when trying to deploy software.
Good luck 
Sr. Cloud Solution Architect at Microsoft, I’m passionate about helping customers succeed by building secure, scalable, and innovative cloud solutions – with a strong focus on AI, DevOps practices, and end-to-end security. With a proven track record in the IT and services industry, I serve as a trusted advisor, partnering closely with organizations to guide them through digital transformation and maximize the value of their cloud investments.
My role combines technical leadership with project ownership – from designing modern architectures to leading cross-functional implementations that drive real business outcomes. I also manage and empower strategic partners, working hand-in-hand with them to ensure project success and deliver measurable business impact for customers.