HTTP 500 error after plugin install

The simplest way to disable a plugin when there is no access to admin, is renaming of plugin folder.

Connect via ftp by Filezilla, for example. Find plugin folder and put dot before its folder name. This should look like

wp-content/plugins/.bbpress/

Such folder names are ignored by WordPress. Update the admin page and you will see that bbpress is removed from the plugin list.

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