Cannot install several monthly Windows security rollup updates

Hi,


I cannot install the following Windows security rollup updates:

- 2017-03 (KB4012215)

- 2017-12 (KB4054518)

-2018-10 (KB4462923)


I am using Bitdefender as anti-Virus Programm. It indicates the last 2 updates as to be installed. If I am trying to install them through Bitdefender, I get the error message below:




The download is interrupted due to a lacking Internet Connection but the Computer is actually connected to the Internet through WiFi.


I then downloaded the 3 security rollups from the Microsoft Website. When I run the either one of the files, I get the following error message, telling me that the update was not installed without giving an error code.




Has anybody come across similiar problems? I am not even sure if all the other monthly security rollups are installed. How can I check that?

Any advice/support would be much appreciated. I am using Window 7 for x64.

Best regards