It's a good question. This zip is created in finder with "compress" menu, so i don't know why not uncompressing under Tiger. If u can uncompress it, it maybe works, or maybe not. Dropbox under Leopard and Snow Leopard using FSEvents API to monitor file changes in folders, and this API is unavailable in Tiger. I think, if we fake OS X version to Dropbox, the faked client can't work anymore under Tiger because of missing API's
I tried stuffitexpander now (instead of the build in unarchiver). Now it unzips completely without error message. (I have to type in my password several times though).
The result an invisible icon (you do see nothing until you click once on the name), but a visible icon-name "dropbox". When I drag and drop it into the applications folder I get the normal blue icon.
(I put my pre-existing install before, btw.)
When I then double click the new item, I am asked again to type in my system password. It takes some time than and I get a message:
"Dropbox couldn't be started.
Usually this points to an error in the permissions. Furthermore the saving of the base folder on a network share ("Netzwerkfreigabe") can cause an error.
If you need further information, please click on the help button below."
When I do this I am forwarded to a Dropbox trouble shooting page on the net.
Also, when I try to delete the icon/app it says, the app is running and can't be deleted. So I went to activity monitor and there was "dropbox.bin". I closed that process/thread.
I tried deleting the folder "dropbox_u501" now from library, and reinstalled the app. The folder in library is not created new. I have the "dropbox_u501" in my trash, still. It was installed on the 20th of may. In which library would I have to put it back?
Also, I reinstalled the old regular dropbox app per drag and drop from my trash, but the library folder was not created again. The app though gives me the set up window, where one can Type in his account infos (email, password).
I suppose the dropbox_u501 folder came with the new install. Do I need it and in what library would I have to put it back? It is also not created again, when I unzip the dropbox-app.zip just once more and install the app again.