How to install the real Thunderbird on Debian wheezy?

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http://unix.stackexchange.com – I have Crunchbang 64 bit, a debian wheezy distro. Debian have a rebranded Firefox called Iceweasel and a rebranded Thunderbird called Icedove. But I don't want any of them. I was able to install the latest version of Firefox by adding Linux Mint repo, and installing it from there. I did the same and installed Thunderbird, but it tells me that I'm not using the latest version, I need to download it from their site. I downloaded it from the site and when i run sudo sh run-mozilla.sh I get run-mozilla.sh: Cannot execute I tried different commands, none worked. Do I need to chmod it? (HowTos)