Alexey, that’s what i do. WordPress clean, installed plugin required but the single import doesn’t work. I solved it by upload your all-in-one.wpress file but like another people here that reset all my login details. I fix it now but it wasn’t very simple.
Also i have a problem with “icon round box” extension, icons don’t appears, i try many things but nothings change, if you have any idea about that it will be great.