I don't think the patches create backup versions of the files they replace, so in order to revert to an earlier version, you would have to un-install, then re-install the game without the patch. Games saved under version 1.34 are not compatible with the 1.29 CD version.
There are probably patch mirror sites around with the earlier hotfixes and patches, though only the latest is on the official site. The latest patch does not introduce any problems that I am aware of, so there shouldn't be any need to stick to an earlier version.
