White screen of death - version 8.5.4.

I just downloaded the latest version of Concrete5; version 8.5.4, extracted it, created a database and webserver configuration and then went to the url and got a 'white screen of death' instead of the install screen.

Figured out what was going on:
There were no errors in the logs because of error suppression in file /application/bootstrap/autoload.php ( if (!@include(DIR_BASE_CORE . . .). The error being suppressed was this: Fatal error: Class UpdateHelper\ComposerPlugin contains 2 abstract methods and must therefore be declared abstract or implement the remaining methods ...(truncated).

I solved this by removing the '/concrete/vendor' folder and running a composer install from command line in the 'concrete' folder. I now have an installation screen.

Is anyone else experiencing this issue?