mmh, ich probiere das mal aber hier noch mal die ganze fehlermeldung, aus der ich schliesse, dass es doch an was anderem liegt.
Die Aktualisierung konnte nicht installiert werden, da einige Dateien nicht kopiert werden konnten. Dies liegt meist an inkonsistenten Dateiberechtigungen. languages, languages/readme.txt, settings.php, modules, modules/akismet.php, modules/really-simple-captcha.php, modules/listo.php, modules/date.php, modules/constant-contact.php, modules/textarea.php, modules/text.php, modules/acceptance.php, modules/flamingo.php, modules/response.php, modules/number.php, modules/count.php, modules/quiz.php, modules/hidden.php, modules/submit.php, modules/recaptcha.php, modules/select.php, modules/file.php, modules/checkbox.php, wp-contact-form-7.php, admin, admin/css, admin/css/styles.css, admin/css/styles-rtl.css, admin/css/styles-dark-mode.css, admin/edit-contact-form.php, admin/js, admin/js/scripts.js, admin/js/tag-generator.js, admin/images, admin/includes, admin/includes/tag-generator.php, admin/includes/class-contact-forms-list-table.php, admin/includes/welcome-panel.php, admin/includes/help-tabs.php, admin/includes/config-validator.php, admin/includes/editor.php, admin/includes/admin-functions.php, admin/admin.php, readme.txt, images, images/service-icons, images/ajax-loader.gif, uninstall.php, license.txt, includes, includes/controller.php, includes/integration.php, includes/css, includes/css/styles.css, includes/css/styles-rtl.css, includes/capabilities.php, includes/contact-form-functions.php, includes/formatting.php, includes/js, includes/js/scripts.js, includes/js/jquery-ui, includes/js/jquery-ui/themes, includes/js/jquery-ui/themes/smoothness, includes/js/jquery-ui/themes/smoothness/jquery-ui.min.css, includes/js/jquery-ui/themes/smoothness/images, includes/js/jquery-ui/themes/smoothness/images/ui-icons_888888_256x240.png, includes/js/jquery-ui/themes/smoothness/images/ui-bg_glass_65_ffffff_1x400.png, includes/js/jquery-ui/themes/smoothness/images/ui-icons_222222_256x240.png, includes/js/jquery-ui/themes/smoothness/images/ui-bg_highlight-soft_75_cccccc_1x100.png, includes/js/jquery-ui/themes/smoothness/images/ui-icons_cd0a0a_256x240.png, includes/js/jquery-ui/themes/smoothness/images/ui-bg_glass_75_e6e6e6_1x400.png, includes/js/jquery-ui/themes/smoothness/images/ui-bg_flat_0_aaaaaa_40x100.png, includes/js/jquery-ui/themes/smoothness/images/ui-bg_glass_95_fef1ec_1x400.png, includes/js/jquery-ui/themes/smoothness/images/ui-bg_flat_75_ffffff_40x100.png, includes/js/jquery-ui/themes/smoothness/images/ui-icons_454545_256x240.png, includes/js/jquery-ui/themes/smoothness/images/ui-icons_2e83ff_256x240.png, includes/js/jquery-ui/themes/smoothness/images/ui-bg_glass_55_fbf9ee_1x400.png, includes/js/jquery-ui/themes/smoothness/images/ui-bg_glass_75_dadada_1x400.png, includes/js/jquery-ui/themes/smoothness/theme.css, includes/js/jquery-ui/themes/smoothness/jquery-ui.css, includes/l10n.php, includes/form-tag.php, includes/special-mail-tags.php, includes/config-validator.php, includes/upgrade.php, includes/contact-form-template.php, includes/form-tags-manager.php, includes/rest-api.php, includes/shortcodes.php, includes/submission.php, includes/functions.php, includes/contact-form.php, includes/validation.php, includes/pipe.php, includes/mail.php