hi @DaveP I also responded on your GitHub issue, please try this workaround:
essentially you want to rename the dynamo core 2.0 avalonEdit dlls so that the revit dll is loaded. It’s quite strange though that 2.0 would effect 1.3.2 as they should have separate core installations.
It might also be worth checking if duplicate copies of these dlls somehow got copied into the dynamoRevit folders.