1, File occupied: During the installation process, some files are being used by other programs, resulting in the installation failure. Before installing tax ukey, you can close other running programs, especially those that are using the files to be installed.

2. Permission problem: The installation of tax ukey error code 5 is due to insufficient permissions, which makes the installation program unable to proceed normally. Run the installation program as an administrator, right-click the installation program, select Run as an administrator, and then install it again.