Cannot find where to replace Explorer

Using Opus in Windows 10, Dutch language, I can not find WHERE I can tell Opus that I want to use Opus in stead of Explorer.
I can not follow the English helpfile instructions using the Dutch programm.
If you know the answer, please refer to the DUTCH instruction-words.

Explorer Replacement is part of Directory Opus Pro and not in the Light version. (See the Light vs Pro chart for a summary of differences.)

If you want to upgrade from Light to Pro you can do so for just the difference in price.

OK, Thanks for your quick answer. I'll think about Pro-version