Can't install: error while registering library

I have tried to install the plugin in a thousand ways:

  • First in 32bit version, both the plugin and Excel.
  • Later, with a 64-bit version, both the plugin and Excel.
  • Also manually, by dragging the .xll file

In all cases, Excel unexpectedly closes while the "Registering library: ....." message appears.

In all cases both with my user and with admin.
Could you help me?
Thank you very much in advance.

Can you try to install manually via the add-ins menu, according to this guide?

I already tried, but it still doesn't work.
I guess it's a company security issue.
Thank you very much for the help

I think so as well. I would try to disable security programs temporarily and see if it helps.