Using WPI to install PHP Manager for IIS on Windows 10 and it failed immediately with an error log
MSI install return value for product 'PHP Manager for IIS' is '1603'
Then here’s quick fix, hopefully it will works for you too
1. Make sure you have .NET Framework 3.5 (includes 2.0 & 3.0) installed
2. Change HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3SVC\Parameters\MajorVersion to 8
3. Run MSI or use WPI to install PHP Manager
4. Change HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W3SVC\Parameters\MajorVersion back to a (10 in Decimal)