The Tutorial said:
You will probably want to keep a copy of Scrivener 1 installed for working with your important projects. This is okay to do, you’ll need to install the beta into a different folder when asked where to do so.
As the Software Engineer I am, I did that of course in advanced. What I did not expect is that my Scrivener 1 Link disappeard from Windows 10 start menu.
Surprised by that I first thought that the BETA Installer uninstalled/replaced my former Scrivener installation.
But why should the programers mention that note in the tutorial manual?
I checked my hard disk drive and found both folders peacefully sidy by side. I clicked on the old version of scrivener.exe and Scrivener 1 opened as it should.
If the same thing happened to you, search for the scrivener 1 folder on your hard disk drive. If you did not change the location during the instalation process, it might be "c:\program files\scrivener".
You should find the scrivener.exe located there and could recreate a new start menu link with a right click on the program file. In the menu you should find an option to pin it to the start menu.