Uninstall CIS 6 via command prompt

As I know CIS 5 could be simply and silently installed/uninstalled via command prompt:

msiexec /i /qn /norestart cis_setup_x64.msi
msiexec /x /qn /norestart cis_setup_x64.msi

But CIS 6 supports only installation:

msiexec /i /qn /norestart cis_setup_x64.msi

Then I try to remove CIS 6 via command prompt:
msiexec /x /qn /norestart cis_setup_x64.msi
, I receive 1603 error.

Are there any suggestions/solutions, guys?