Can't Install Latest Upgrade for Word Press

hi i think you have problem with memory limit.

please cek detail in here https://www.ads-software.com/support/topic/php-memory-limit-not-updated

hope this help ??

or try this :

write in wp-config.php file following code
define(“WP_MEMORY_LIMIT”, 128);

One more thing that when you updare the php.ini file then need to restart the server(apache or IIS); After that you will get updating settings.