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Can´t install Plesk 12

Make sure that you have the same size and permissions for this file:

# ls -la plesk-installer
-rwxr-xr-x 1 root root 5604 May 29 16:19 plesk-installer

Also try to run installer in verbose mode with

# sh --verbose plesk-installer
 
Dear IgorG,

Thanks for the reply.

root@xxx:/var/tmp# ls -l
total 60540
-rwxr-xr-x 1 root root 5604 jun 11 08:56 plesk-installer

root@xxx:/var/tmp# sh --verbose plesk-installer
sh: 0: Illegal option --

I download again the file, same problem...
 
It seems to me there is something wrong with your OS.
What about

# sh plesk-installer
 
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