Yoast plugin problem

Hey Everyone.

I am facing some serious issues lately. Looks like i have a bug.
In the moment my yoast Seo plugin vanished and i am not able to install him again.
I was doing a lot of SEO for my articles in the last 8 month, so thats kind of a night mare.

I can not see any SEO buttom on the Dashboard, or menu and can it show always plugin installation failed when I try to upload yoast again.

one more questions. Whats hapen when i upgrade to premium. Do I loose my content?

Very best

Joe