Install script won't run

[salass00]

I just downloaded the Linux version of AMFP from GamersGate (I preordered it) but I can't get the install script to work.

I extracted the rar archive:
$ unrar e ~/Downloads/AmnesiaAMFP-1.0.0-Linux.rar

Added execute permissions to the sh script as they were missing:
$ chmod 755 AmnesiaAMFP-1.0.0.sh

But when I try to run it I get:
$ sudo ./AmnesiaAMFP-1.0.0.sh
/bin/sh: 0: Can't open ./AmnesiaAMFP-1.0.0.sh

md5sums of archive and script:
$ md5sum ~/Downloads/AmnesiaAMFP-1.0.0-Linux.rar ./AmnesiaAMFP-1.0.0.sh
5f5a9c5e7d0637166f0b8b9d1f72377c /home/salass00/Downloads/AmnesiaAMFP-1.0.0-Linux.rar
bc92782fafc84475dff306906184e060 ./AmnesiaAMFP-1.0.0.sh

I'm using Ubuntu 12.04 LTS BTW.

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Found a solution using google:
http://mavroudisv.eu/blog/2013/04/17/sh-...nd-ubuntu/

If I type "sudo bash ./AmnesiaAMFP-1.0.0.sh" the install script runs correctly.

I've never had this problem running sh scripts before though...