We released v0.1.0-beta.8.2 to tackle the issue many people have with updating or installation. The issue was caused by font awesome releasing a version that changed paths of some of their files. If you installed Flarum between June 4 and June 12, you are likely experiencing this issue.
No action is needed if your forum already is on v0.1.0-beta.8.1 from before June 4! This fix is contained in the upcoming beta 9 as well.
In case you've applied a suggested patch/fix, make sure to reset that patch. This means removing any references in composer.json related to components/font-awesome and in case of modifying files in vendor resetting those changes (or deleting vendor/flarum/core).
Then run
composer update flarum/core --no-dev -o
In case you encounter any further issues feel free to ask for help in our support tag 👍️
