Aladdin is sending out copies of Spring Cleaning 1.0.1 by email to those who had previously written to them with bug reports or complaints. Aladdin writes: "This release has many significant improvements, especially in the area of memory management." (Thanks, Bob Clarkson and Bob Patterson.)
So far, there has been no sign of an update file posted online.
Update: Hillel Cooperman (of Aladdin) informs me that the 1.0.1 updater will be posted on their web site ASAP. They sent out the full installer to "some customers who were having 1.0 issues so they didn't have to wait another moment for the fixes."