Unreal Engine 4.11 Preview

I had 4.11P1 installed here and then later uninstalled. Now I want to install P3. The launcher offered me “update” although I did uninstall 4.11 before. After that upgrade process, the whole 4.11 is gone from the launcher and it doesn’t offer me to install it again, I can’t access it at all. I deleted the 4.11 folder but same result.
What can I do to get it to show in the launcher again?

NM, got it solved. I cliecked on Add New Versin and it showed my 4.7 to install, but when I clicked in the down arrow in the 4.7 button it offered me to switch this button to 4.11. A weird interface, but it worked at least