I have had my Android x86 version 4.3 installed in my VirtualBox since April 2014. With software upgrades being released by the day, I think its about time I have this operating system upgraded to a more recent release.
Version 7.1 r2
Version 7.1 r2 looks like a good bet, out since May 2018.
But after spending something like two hours downloading the installation ISO image, it looks like it wouldn't work with 512 MB RAM in VirtualBox - that's all I could afford in my 1GB RAM computer. There is lots of disk activity alright; it doesn't seem to stop. After waiting for something like 20 minutes and not seeing the home or setup screen, I gave up.
Installation was a breeze though. It zip right through in about a minute.