I upgraded a fresh 3.2 image to 3.4a.  Then I did "open...->Package 
Loader" and loaded SqueakMap, then SMLoader, then opened SMLoader when 
prompted.

When I tried to select the SMLoader menu option "set download 
directory", I  got a DNU exception for #specsForFolderSelector, 
triggered in FileList2 class>>morphicViewFolderSelector:.  Looks like 
the method was removed in update "5013u24-fileList2Fixes-sw".  

I'll post a fix in a minute.