rusfolder.ru (ifolder.ru) - ERROR File name not found

Hi guys, I am getting this error (File name not found) quite often for rusfolder, although the page is fine and the file is actually downloadable through browser. I was trying to figure out what could be wrong but I'm a bit noob when it comes to Java. Other downloads from rusfolder are fine, it seems to be kind of random to me. Below are 2 examples giving this error, would anyone be able to look into it?

[rusfolder.com]
[rusfolder.com]

Thanks in advance

links work for me
when this error occurs FRD puts the error details in the log file with the html received that caused the error

if the error happens again attach the log file (Help > Browse to log file)