Downloading updated app for Mac

[StuartR]

Hi all: When I enter JK, I get prompt to start update of new version.  So far so good.  When that finishes, I get prompt to download app (for Mac), but when I click on the download button, nothing happens (I've tried single clicking and double).  OS is 10.9.5, and I haven't had any issues up until now.  (And I can't enter or start a session.)  Any suggestions?  Thanks!

I have similar update difficulties today; up until today have been using JK without a problem OS 10.10.5
Now cannot use the JK app, "requires the update".
I had to go to JK download site, obtained the update, but it won't run, provides message "no mountable file systems"
Wonder if uninstalling the app and do a fresh install would work ?

They regressed the latest app so give it a bit and try running JK again. It should ask you to install the previous version. At least that's what happened to me with the Windows client.