Upgrade Oracle Virtualbox on Centos7/Clearos

Stop all guest instances
stop vbox web service:
systemctl stop vboxweb-service
ps -aux | grep virtualbox
showed 2 other services, I terminated them with pkill <some id number>
uninstall old virtualbox
yum remove VirtualBox-5.2
downloaded newer rpms VirtualBox-6.1-6.1.16_140961_el7-1.x86_64.rpm and Oracle_VM_VirtualBox_Extension_Pack-6.1.16.vbox-extpack
installed both with:
rpm -Uvh VirtualBox-6.1-6.1.16_140961_el7-1.x86_64.rpm
VBoxManage extpack install Oracle_VM_VirtualBox_Extension_Pack-6.1.16.vbox-extpack
downloaded phpvirtualbox-develop.zip
my version was phpVirtualBox 6.1-0 -/- VirtualBox 6.1.x compatible
copied to /var/www/html/phpvirtualbox
restart apache2 , done. Took about 10 minutes.