I use "File Download 1.3" from http://www.zubrag.com/scripts/ for a while and it work great.
But today, I change my webhosting. The same script give me "unknown file size" instead of file's actually size it used to give me.
I think major factor is the same between 2 webhosting (eg. php version, disable function, etc)
Anyidea how it's happen ? How to solve this issue ?
Here is screenshot
Download from old server

Download from new server

Any suggestion will be appreciated,