However, if even now you are facing issues, then you will have to make some changes to the Windows Proxy settings.

Then head over to Advanced and make sure that the Proxy Server option is disabled.

For that, open Bitdefender and go to Settings.

If you aren’t using Proxy, then you should double-check that the option is disabled inside the antivirus as well. Once that is done, launch Bitdefender and the Error Code 1004 should be fixed by now.

Select the Custom proxy settings option and type in the required value.

However, if you wish to enter custom proxy settings, then click on Proxy Change under the Advanced section.

The app will now import all the proxy settings from your browser.

Enable the toggle next to Proxy Server.So launch Bitdefender and head over to Setting.In such cases, since your PC is using a Proxy server, you need to enable it inside the antivirus as well. In some instances, manually updating the antivirus software is able to rectify the aforementioned issue. We would still recommend that you keep the first fix enabled while going for the next one given below. If it is still there, then here is another approach that you could try out. Once that is done, try updating Bitdefender, the Error Code 100 would be fixed by now. If it’s not there, then click on Allow Another App, navigate to the Bitdefender file and add it to this list. Now scroll to the Bitdefender file and checkmark it.You will need administrative privileges to carry out this task. Then click on Change Settings from the subsequent dialog box that appears.

Or if you wish to add the app to the exclusion list, then click on Allow an app or program through Windows Defender Firewall.Select Turn off Windows Defender Firewall under both the Public and Private network sections.Click on Turn Windows Defender Firewall On or Off from the left menu bar.Search for Windows Defender Firewall from the Start menu.Or if you could don’t wish to disable the Firewall, then you could also add Bitdefender to the whitelist. Asa result, you could temporarily disable Firewall before initiating the update. In some instances, the Windows Firewall might conflict with the software’s update process.

Bitdefender 2019 update