Can i install the v7 again even if the v9.5 is there

Hi,
I just install Cubase pro 9.5 & as usual there is a shortcut on my windows desk … this v9.5 shortcut join my 2 previous shortcuts, that is to say : the v8.5 & v9 … i ask: is this is ok ?
I have Cubase since v7 … but i remember that to install the v8, i uninstalled the v7 completly !
Now since this time i constantly upgrade (now v9.5)
Question :
Can i open a file from the v8 ?
Can i install the v7 again even if the v9.5 is there ?

Thanks a lot for your answers.
Daniel