REDDOG99 Installed the 5.10 upgrade on a Mac Pro with 10.6 and app would start and quit with Java errors. Davis tech support advised to use "Get Info" and to check off "Open in 32-bit mode". Now the program runs fine. (Version 5.1.0)
DAVIDBPRATT The download installed a .jnilib file in the Weatherlink folder but Weatherlink 5.0.3 still crashed on OS X Version 10.5.1
The message was: java.lang.UnsatisfiedLinkError (Version 5.0.3c)