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I wouldn't call this a problem outright. More like an annoyance.

If you're using Eddie, enable Network Lock. With vanilla OpenVPN it's much more complicated. Others may answer your first question.

Well, reading all posts on this forum could be time consuming... But I have read all the posts on this thread, and found no solution. Now, the good news is : I found one by myself. In case it could help someone, here it is : I just installed windows updates, ( I omitted doing that for a long time, including .NET framework v. 4.xx), Then, the required network adapter was installed without problem. I guess older versions of .NET framework triggered the fail. I wish this can be useful for other people, too.

Here's some "help": Open your own thread, or at least show a notion that you read all the posts before yours. "I've got the same issue" posts don't help OP at all.