Error Invalid install response when updating the script

The update requires php7.4

To update the php login to your cpanel 

1. If your hosting is using Cloudlinux
scroll down to the software section and click on Select PHP Version

use the dropdown to select 7.4

then on that same page click extensions

on the extensions page check

ion cube loader

Uncheck  mysqli

check nd_mysqli

2. If your host is NOT using cloudlinux
scroll down to the software section and click on Multi PHPManager
on that page check the site you want to update
then on the right use the dropdown to select eaphp7.4

Then you can update the script and the pages should work unless you have an old sidebar theme.

if that is the case go into admin

LFMTE> TE Settings and check the box next to Use Old Theme Pages