I am installing Maxim 6.17 on a new Windows 10 Ultimate installation. I have the license email for 6.17 as a txt file. After installing Maxim 6.17, the registration screen comes up with all the fields grayed out. If I try to use Load file button and select the license text file, it reports "no valid license could be found in this file". The file seems to have all the necessary elements. How should I proceed? Thanks.