Downloading problems

[Clannad99]

Hey, I am new within this site and I use it to download lots of files. I'am searching for older and special "masterpiece" movies form the 80's and 90's and also new stuff.

My problem is now, that I am using a premium account of depositfiles and Rapidator since 3 weeks and almost every file does not work after downloading it.
For example Files with the extension .rar especially but others to. Very often I get the message file do not work or is damaged or other things. In some cases the (rar) file needs a password for opening it, so I am asking myself why I should have a premium account for the 2 mentioned filehosts, if the most files do not work or is something wrong the way I am downloading. Maybe somebody can give me support, give me some advice or have experience with depositfiles and rapidator. Thanks.