Theme Install fails

I/ Please check your theme requirement: http://www.cortana.osthemes.biz/wp-content/uploads/documentation/#!/installdata
1. What version php do you using? If lower 5.4, please update to 5.4 or greater.
2. Check your folder theme has permission create/write file? if not, please set permission for it.
3. PLEASE SET VALUE FOR VARIABLES BELOW IN PHP.INI/.USER.INI/.htaccess or some where(you should ask your hosting provider):
max_input_vars = 3000
memory_limit = 128M
max_execution_time = 300
max_input_time = 300
upload_max_filesize = 64M
post_max_size = 64M

II/ Please try other way: Upload via FTP ==> http://www.cortana.osthemes.biz/wp-content/uploads/documentation/#!/upload