I know that WLM is on the way out, but we have a ton of WLM mail folders that need to be converted to a different format. Thus, I want to install it on a clean Windows 10 installation.

The installation tool tells me it needs .net framework 3. OK, I download the .net installer and run it. It seems to check if the required files are on the PC, then switches to downloading required files. Nothing has happened for an hour or so. Is the download that large?

Yes I am connected to the internet. Speedtest.net claims a download speed of 6.6 MB/sec.

What can I do to get WLM installed?

Screenshot: downloading required files, no progress.