When updating from Cubase 8 pro 8.0.05 to 8.0.20: do i have to install update 8.0.10 first? Thanks.
No, it is not necessary to install .10. .05 can be upgraded directly to .20.
http://www.steinberg.net/en/support/downloads/downloads_cubase_pro_8.html
Regards. 
Thanks.