MTU: won't respond to registration code issue

[is14fun]

I've been running v 5.35.01 on my two computers. I upgraded to 5.40.01 on my desktop but not on my laptop. I then upgraded to windows 10 on both machines. I have no problem with 5.40 on my desktop but when I went to upgrade my laptop to 5.40 I get a message that I have exceeded the number of computer I can install Hoster on. Now, I was running Hoster on both machines with no problems until I tried to upgrade. I only have two computers. Well, when I did the install I selected uninstall Hoster. I thought then I would be able to reinstall 5.40. But no, I still get same response. It redirects me to MTU website. Registration code and computer name is correct. I have been waiting 3 days for a response from MTU but as of now, notta! Is there any way I can get either versions reinstalled on my laptop? I have a gig coming up and need this done.