3D Warehouse just keeps loading

What are you talking about? The fact that I have the 2021 version does not mean that:
1 want to use it
2. I can use it (e.g. extension compatibility)
3. in a year it will still work

Who will guarantee that in two years Trimble will not announce that due to the “modern” viruses it will not be possible to log in to the license servers of the old classic versions for security reasons. So it will say: sorry Winethou you can’t login, you can’t use. What you can see here:

and here:

The fact that your program has holes in the security system does not mean that you can limit its functionality and break the terms of sale! You are responsible for errors in the program and you are to fix it without limiting the functionality. And you can put a fairy tale about safety among other fairy tales. It is known what it is. You want to force users of the classic versions to switch to a subscription this way

Of course, no one is willing to answer my questions?