It seems that the Wifi firmware updater isn't working properly on IDE 1.8.8. I was attempting to update my new WINC 1500 and the only firmware offered is the Model A (19.4.4) not the current version of Model B (19.5.4). I ran IDE 1.8.7 on my older MacBook and it offered versions from 19.4.4 up to the required version of 19.5.4.
I downloaded the nightly build and it also does not offer the correct firmware versions.
I was able to update the firmware correctly with the 1.8.7 version, just wanted to let everyone know of this issue.
Thanks,
Carroll