White screen of death - version 8.5.4.
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?