Rukovoditel Support Forum

Try to rewrite files. The best way is load archive to server an unpack it there.
If not help then ask your hosing support why you have "500 (Internal Server Error)" to include css file. Probably issue with file permission or something like this.

If user change listing configuration then changes in default listing configuration will not apply, because listing uses user setting.

Can you reproduce this issue on personal demo?
https://www.rukovoditel.net/demo.php
Give me the link to your demo and I will check.

Composer use PHP_VERSION_ID variable to check php version. Code example is: if (!(PHP_VERSION_ID >= 80002)) { $issues[] = 'Your Composer dependencies require a PHP version ">= 8.0.2". You are running ' . PHP_VERSION . '.'; } Ask your hosting support why this part of code not working.

I did test and I can't reproduce it. Try to type Enter after "Hi"

Can't reproduce it.

The source for this filed type was missed. Added it. File from archive replace to plugins\ext\classes\api\
Let me know if it works ok now.

Can't reproduce it. Probably browser cache.
Anyway replace/remove /favicon.ico file in root folder. This file browser uses by default.

Try to create backup using phomyadmin.

Hard to say what is it. Try to do backup and restore under phpmyadmin.