This seems like a good idea to me. sparkleBundle property in SUHost is completely useless/unused now (and technically wrong anyway). It should be removed.

Can we use -[NSBundle bundleForClass:] for SULocalizedString()? Just pick a class (e.g.: SUHost) that's shared between Sparkle.framework and Autoupdate.app. I presume Autoupdate.app has its own copy of string files.

OK, I was wrong about sparkleBundle not being used. The code seems fine considering where -userAgentString and -installWithToolAndRelaunch:displayingUserInterface: is being called, but I am wary about sparkleBundle being a property of SUHost, when [NSBundle bundleForClass:[self class]] can just be executed outside.

Autoupdate.app doesn't have its own strings files. I'd rather not split them, as this makes strings maintenance harder.

OK, SUUpdater seems like a better fit for the bundle

What are all the .strings files I see generated inside of Autoupdate.app for? I see that some of the resource files are copied over from Sparkle.framework to Autoupdate.app perhaps maybe to avoid this problem

If you grep for [NSBundle bundleForClass:[self class]] you can see it's already being used in SUSystemProfiler.m too. SUUpdater.m and SUBasicUpdateDriver.m would be to affected files for us.

What are all the .strings files I see generated inside of Autoupdate.app for

Oh, I didn't notice there were there. It's a dupe of framework's strings files, so hopefully it could be avoided? Seems wasteful.

If you grep for [NSBundle bundleForClass:[self class]] you can see it's already being used in SUSystemProfiler.m

That class is currently independent of SUUpdater, and that call works, so I'd leave it as is.

Oh, I didn't notice there were there. It's a dupe of framework's strings files, so hopefully it could be avoided? Seems wasteful.

It may seem 'wasteful' but could help save us from this issue, which I think would be worth it.

If it's too wasteful to have two copies, you can put only one copy in Autoupdate and have a relative symlink in the framework that points to the file in Autoupdate.