Hello!
I have the same problem:
Parse error: syntax error, unexpected ‘?’ in /wp-content/plugins/redux-framework/class-redux-framework-plugin.php on line 76
I deleted and installed the plug-in again, but that did not help.
Unfortunately, the answer in this thread does not help me and I don’t know what to do to fix it. My website is not working fully without it.
Thank you for any help!