PHP switcher not working on newly installed CWP.

I am trying to upgrade the default PHP 5.6 to PHP 7.4.x  but the PHP switcher is not working.   

Does anyone solve this?

What is the problem you have had? What error are you getting?

low ram can be an issue or other dependencies are failing to install because of OS issue. CHECK LOG

low ram can be an issue or other dependencies are failing to install because of OS issue. CHECK LOG

I have 32 gig of ram.  Which log can I check? 

What is the problem you have had? What error are you getting?

There were no error.  It wasn't updating.  Did you try updating yours? 

low ram can be an issue or other dependencies are failing to install because of OS issue. CHECK LOG

I have 32 gig of ram.  Which log can I check?

Looks like you don't pay much attention - scroll to the bottom,when you initiate a build and you'll see:

PHP Compiler Started in Background. You can monitor PHP rebuild from the console using command: tail -f /var/log/php-rebuild.log

Granted,it would be more useful/noticeable if the message box appeared at the top, given that screen automatically refreshes at the top. 
(My 1GB RAM VPS has now locked up reverting 7.4.11 to the last 5.4 build.. patience!)

10 minutes later..

tail -f /var/log/php-rebuild.log
You may want to add: /usr/local/lib/php to your php.ini include_path
/usr/local/src/php-build/php-5.4.45/build/shtool install -c ext/phar/phar.phar /usr/local/bin
ln -s -f /usr/local/bin/phar.phar /usr/local/bin/phar
Installing PDO headers:          /usr/local/include/php/ext/pdo/
Make Install DONE!
####################
PHP Rebuild Completed
#########################

DELETING DSO Handler
^C

It's CPU & disc bound, not RAM

Load: 18.02  14.64  6.94
Memory RAM (with Cache): 0.86GB / 1GB ( 86%)
Swap Memory: 0.01GB / 1GB ( 1% )
System CPU Model: AMD Ryzen 9 3950X 16-Core Processor
VPS CPU Details: 1 Core (3493 MHz)
NVMe Disc I/O peaking frequently at 100