Fix the site upgrade to Joomla

Need to fix the updates for the site https://dvfu-english.ru

1. Not updated to the latest version of Joomla (https://prnt.sc/tdjq9k)

2. Breaks down when you try to upgrade the hosting to php 7.4 (https://prnt.sc/tdjr2q)

3. Shows error update RS Form and a failure Joomlashack.