Is this accidental, by any chance? The update is said to fix “Printing of rich text view on OS X 10.6 Snow Leopard”, yet it requires at least 10.8.3.
The App Store version has to meet Apple requirements related to sandboxing.
The App Store version of the next release of DEVONthink Personal requires Mountain Lion.
Presently, applications purchased from our store can still run under older versions of OS X.
The free-world version supports still 10.6.8 but both versions use the same documentation & version history.