Since Mojave at least, when upgrading MacOS point release (in this case, 10.14.4 to 10.14.5) and completing OS restart, an error box warns that Indigo needs to be upgraded. While I know that Indigo still functions, the error apparently prevents Indigo Server from starting up after the MacOS restart. I then upgraded to Indigo 7.3.1 and wondered if a change to Indigo was made in 7.3.1 that no longer causes MacOS to post that warning about Indigo.
Is the error related to Indigo being a 32-bit application, rather than a 64-bit application? I think I recall that was the reason the errors were being posted. I think there was a thread about this, but I couldn't locate it. Do others see this error about Indigo when upgrading MacOS?