Penumbra Collection - Serial Number

[jaom7]

Hi,
Similar to Pringle9984 , I really appreciate that you developed this game for gnu/Linux as well.
I have the following problem:
I bought on July/09 the Penumbra Collection under the $5 special that was back them. I just formated my computer, and it looked like I had my activation code and everything, but in the moment of executing the installer, I received a MD5 checksum error. For this reason I wanted to know if there is a procedure i can follow to have a re-download the file.

THanks for the attention given to this message and thanks in advance for the help provided.

regards,

jaom7