32-bit indesign CS6 compatibility with macOS High Sierra 10.13.4

It’s like an all you can eat buffet. You don’t get a refund if you leave some food behind on the counter.

32-bit CS6 InDesign works with High Sierra, though with some minor irritations. It will not work at all once Mac goes over solely to 64-bit. It is disgraceful that Adobe tries to make one go over to subscription-only CC. I for one, and I am sure I am not the only one, want nothing to do with a cloud-based subscription, with which you lose access to your own work if you stop paying the sub. For this reason, in preparation for the future, I have just bought 64-bit non-subscription QuarkXpress, at a roughly half-price offer for such as InDesign users (I think the offer may have just expired – not sure). Although Quark will obviously take some time to get used to after years with InDesign, at first glance, whatever Quark was in the past, it now looks good and relatively intuitive. Personally, I think there is cause for a class action against Adobe for the way they are holding InDesigners to ransom. I also find it disgraceful that it is extremely difficult to find out how, if it is even at all possible, to write a direct complaint to the powers that be at Adobe.

I have it running without a problem. You have to drop back to the legacy version of Java after the High Sierra install. Here's Apple's Java download page:

Download Java for OS X 2017-001

As Derek says. I hope you made a full system backup before doing that upgrade because going back any other way is going to be very difficult.