This is because the WPLMS package is 22 MB in size which exceeds the theme file upload limit in most web servers.

How to Fix :
1. .htaccess (Location of file: Site Root)

Code:

php_value post_max_size 32M
php_value upload_max_filesize 32M

2. php.ini (Location of file: Contact web host)

Code:

post_max_size=32M 
upload_max_filesize=32M