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WF-Downloads is restricted in four areas when trying to upload files.
1. Max post size. (post_max_size)
2. Max file upload size (upload_max_filesize)
3. Memory Linit (memory_limit)
4. and The max limit imposed by the admin of WF-Downloads.
post_max_size
Sets max size of post data allowed. This setting also affects file upload. To upload large files, this value must be larger than upload_max_filesize.
If memory limit is enabled by your configure script, memory_limit also affects file uploading. Generally speaking, memory_limit should be larger than post_max_size.
I know WF-Downloads works with Surpass, I used to use them a while back. Just remember to up the memory_limit and Max post size larger than the Max file upload size and you should be ok.
ATB
Catz