Fix error 2503 and 2502 when installing programs

Recently I had a curious case while installing the Itaú application on Windows 10. This can also happen on Windows 8.1 and Windows 7. The error means the C:\Windows\Temp folder has incorrect NTFS permissions.

For Windows Installer to work normally, this folder needs write permission and the user needs to own it.

To fix it, follow these steps:

1. Open the folder below. The C:\ drive letter may change depending on where your operating system is installed.

C:\Windows\

2. Find the Temp folder and right-click > Properties.

3. Open the Security tab, click Edit, and then Add.

4. Type Everyone in the names field and apply Full Control.

5. After that, restart the Itaú app installation and the 2502/2503 error should not appear again.