Problem opening .sh file

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http://askubuntu.com – I'm trying to install Torchlight from the Humble Indie Bundle 6. The installation file is an sh file. When I try to run the sh file I get this output. [ user@pc:~/Desktop$ sudo sh ./Torchlight-2012-09-26.sh [sudo] password for user: Current temporary directory (usually /tmp by default) does not seem to be executable! Please specify an alternative path by using the --target option.] How do make the tmp dir executable or specify an alternate path? I'm running ubuntu 12.10 (HowTos)