After copying the most recent release (0.12.2) from https://withknown.marcus-povey.co.uk/?C=M;O=A I uploaded to the Known directory (/stream.willtmonroe.com) in cPanel using FileZilla.  When I visited the site, I got this message:

Parse error: syntax error, unexpected '?' in /home/willtmon/stream.willtmonroe.com/Idno/Core/Idno.php on line 263

When I went to terminal and attempted the composer update, I got this error:

[willtmon@doa ~]$ cd stream.willtmonroe.com/
[willtmon@doa stream.willtmonroe.com]$ composer update
Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - This package requires php >=7.1 but your PHP version (7.0.33) does not satisfy that requirement.
  Problem 2
    - symfony/console v4.3.0 requires php ^7.1.3 -> your PHP version (7.0.33) does not satisfy that requirement.
    - symfony/console v4.3.0 requires php ^7.1.3 -> your PHP version (7.0.33) does not satisfy that requirement.
    - Installation request for symfony/console 4.3.0 -> satisfiable by symfony/console[v4.3.0].