Please try to relog-in (account) or completely close launcher, then open the version history again. I experienced the version history not being able to open but after restarting the launcher it was normal.
If it still does not work, please send us your log file as well as this D5 particular scene file. You can send it to me directly here in forum via direct message.
In version 2.11, the welcome page has been updated to D5 Launcher. If you click D5 Render program, it will enter an empty scene by default. It’s recommended to start D5 Launcher and access projects via it.