Updating contao (no installation tool password)
I'm running my own VPS and a couple sites on joomla which run fine on php 5.6. Now i'm planning to upgrade to PHP 7, but a customer i maintain the site for uses contao 2.11. Will 2.11 work on php 7 without issues? I'd love to upgrade it to a recent version, but i only took over maintenance after the domain owner transferred the site to my vps for maintenance and he does NOT have the original installation password since the person that originally maintained it is no longer involved.
How do i proceed?