The function is quite straightforward, and wasn't changed for years. I suspect that the target application or the OS have to do with the behavior you're seeing.

You can get previous versions of the tweaker here:
https://www.dropbox.com/sh/mcbychsh0xc1dvu/AAC7NwQTQ-tOTNL2BUZ_CwUua?dl=0

You can also compare the behavior with the behavior of other programs, such as the Task Manager.

Let me know if you find out that it worked properly in a previous version of 7+ Taskbar Tweaker (and in this case, which version introduced the issue).

Use the beta version. More details:

https://tweaker.userecho.com/topics/959-could-not-load-library-5

There are other programs that provide such functionality. One is Switcheroo (I haven't used it myself).

Is it McAfee? Unfortunately there's not much I can do about third-party antivirus products. I tried to contact McAfee about it but got no reply. As a customer, please contact your antivirus' support team and ask them to remove the false positive detection.
About a non-beta version that supports the KB4520006 update, I don't plan to release one in the near future. Windows 10 version 1709 is out of support except for enterprise clients, which will only last until April. The version not widely used, and I'm reluctant to disrupt all users with such a specific update.
Sorry for the non-helpful reply, but the proper way to solve this is to get your antivirus to remove the false detection from the beta version of the tweaker.

See my answer here:

https://tweaker.userecho.com/topics/959-could-not-load-library-5

There's a way to achieve this, please see my answer here:

https://tweaker.userecho.com/topics/287-ability-to-run-application-or-even-better-trigger-a-media-button-on-clicking-on-empty-taskbar-space

Which build of Windows 10 are you using? Check this topic, perhaps it will solve the problem for you:

https://tweaker.userecho.com/topics/959-could-not-load-library-5

What version of 7+ Taskbar Tweaker are you using? According to the message, it's not the latest version. Please update to the latest version and see if it solves the issue.

Sorry, but I don't speak French.

Please provide the exact error message, as well as the version of your explorer.exe file.

The actual file is in C:\Windows, but the version of all of the explorer.exe files is the same. According to the version, you're using an insider build of Windows 10. You need to use the beta version of 7+ Taskbar Tweaker with an access code. Check out the beta version changelog and read about 7+ Taskbar Tweaker and Windows 10 insider builds.