How to upload Big Attachment files ?

[pharmacist]

Hey,
I want to share big ZIP files (size from 5 MB to 25 MB) for special users in my forum
I don't want to share these files throw file sharing sites or direct Link because I want some special users only can download these files

I have increased Zip files sizes to 100MG from Attachment Control Panel, and Increase Admin files size to 1GB size

when I tried to upload files throw ( upload from Link) it give me this error

PHP Code:

arning: tempnam() [function.tempnam]: open_basedir restriction in effect. File() is not within the allowed path(s): (/home/:/usr/lib/php:/usr/local/lib/php:/tmp/) in [path]/includes/class_upload.php on line 276

Warning: fopen() [function.fopen]: Filename cannot be empty in [path]/includes/class_upload.php on line 282 


when I tried to upload 5MB file, Message( Failed to upload)
when I tried to upload 16MB file Message(Your submission could not be processed because a security token was missing.)

I have VPS hosting 512 Ram ,500GB bandwidth and Cpanel

Please help,
Thanks