Can not Manage Max Upload File Space after Removing "Upgrades Plugin"

I have removed the "Upgrades Plugin", because after observing for more than 3 months, my site is only suitable for using "Ad Sharing Plugin".

But after that, I can not set "Max Upload File Space" on Site Admin > option. Two months ago I set 39 MB. When I changed to 49 MB, but on user blogs still 39 MB. I changed to 59 MB, but on user blogs still 39 MB.

I removed following files:
paypal.php - goes in / <-- root directory
upgrades.php - goes in /wp-admin
0-upgrades-hook.php - goes in /wp-content/mu-plugins
upgrades-framework.php - goes in /wp-content/mu-plugins
upgrades-payment-module-paypal.php
/wp-content/mu-plugins/upgrade-plugins

On database I removed:
wp_upgrades_credits
wp_upgrades_package_status
wp_upgrades_log
wp_upgrades_packages

I also removed "supporters plugin" with all files and related database

Currently I use following plugins:
CodeStyling Localization
BuddyPress
Akismet
Add to Any: Share/Bookmark/Email Button
All in One SEO Pack
Google XML Sitemaps
Quick Stats
Smart Youtube
WordPress.com Stats
WordPress Database Backup

Mu-plugins:
ad-sharing
admin ads
content monitor
default theme
global-site-search
invite
limit-blogs-per-users
login-image
mass-mailer
post-indexer
ra-theme-stats
recent-posts
remember-me-checked
signup-language
signup-tos
widget-recent-global-posts
widget-users

Please help me to set "Max Upload File Space" on Site Admin > option again.