Cannot uninstall/update

I downloaded the old version and I was prompted to install the new one but an error came up (pic attached)

So update won’t happen, I decided to uninstall it and I got another error:

There is a problem with this Windows Installer package.

[attachment deleted by admin]

Hi,

It seems that something went wrong with shell extension when updating. To solve the problem, you must manually delete the following registry key:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\9147006B16F58324086C009B3879F5ED\

Please click on Start button, select run and type this command:

reg delete HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Installer\UserData\S-1-5-18\Products\9147006B16F58324086C009B3879F5ED\

Type y and hit enter to confirm deleting the key. After, install the latest beta version again (2.0.150966.6). You can download it from the link below.

http://download.comodo.com/ccs/download/setups/CCS_SETUP_2.0_(build_6)_xp_vista_server2003_win7.exe

Next, you can uninstall it properly. This problem will be fixed in the next release.

Thank you for your support.