I've been using IDE 1.6.4 for programming the Uno for 1-2 years and its been working fine. I have a project that could use the 64-bit capability of the DUE. I was not successful in getting the IDE 1.6.4 to download. I read in this forum where someone had done something similar and found they needed to update the IDE to 1.6.9. I did as well and I had success downloading a simple sketch that did not use a lot of library references.
To make sure my UNO project wasn't affected by installing 1.6.9 I tried to compile it and received several errors the referred to issues with several of the libraries. I had not made any changes to the UNO sketch prior to running the new IDE compiler.
So is there a list of things that needs to be done when you upgrade from an earlier version of the IDE to 1.6.9?
Has anyone been down this path?
I have since uninstalled 1.6.9 and got back to a working version of the IDE 1.6.4 that works with my UNO project.
I tried to install 1.6.9 on my virtual XP system but had no luck downloading.