mahjoob

i have this error
Fatal error: Allowed memory size of 536870912 bytes exhausted (tried to allocate 524288 bytes) in /home/…/public_html/wp-content/plugins/ultimate-member/includes/class-init.php on line 75

hi
i Deactivate another plugin and change the php version but yet don’t Activate ultimate member 2.0
and only have this error
Plugin could not be activated because it triggered a fatal error.

i don’t know do for Activate UM
i Really need UM for my site
pleas have a solution for this

thanks