Is it dangerous to reinstall 10.7.4 I installed Mac OS 10.7.4 on my MBP last night, along with Safari 6. I was leery about installing Safari 6, but I figured I could cope with the changes. But, after using it for about 30 minutes I want Safari 5.1.7 back.

My "plan of attack" was to download the 5.1.7 installer, delete Safari 6, and install Safari 5.1.7. After the installer finished downloading I ran sudo rm -rf /Applications/Safari.app. As expected that deleted the application file. However, when I opened the 5.1.7 package installer I get the following error.



I decided that the best way to get Safari 5.1.7 back was to reinstall Mac OS 10.7.4. But before I run the install I have a couple of questions.


Is the "Client Combo" edition the wrong thing?
Will it attempt to install 10.7.4 incorrectly? 
Is there a better way of deleting Safari 6 and installing 5.1.7?
Reinstalling the OS just for Safari seems a bit drastic. The reason it says that is probably exactly because you used rm -rf as opposed to dragging it into the trash.

In OS X there is a central registry of installed applications, and afaik when you drag an application to the trash, it is automatically removed from this registry. When you just rm -rf it will delete the files but not the entry in the registry.

So I'd try : reinstall Safari 6 normally, then drag it to the trash. This should remove it from the registry, so try to install Safari 5 afterwards.

If it still doesn't work, try using the /System/Library/Frameworks/CoreServices.framework/Frameworks/LaunchServices.framework/Support/lsregister tool to manually unregister Safari.