Tell you what, we will remove that warning in the next testing release. It was really intended more for the early states of the multi-sig stuff, but that has been sufficiently ironed out, and we're nearing release. That warning was going to go away anyway.
OTOH, you can always safely downgrade or upgrade Armory. The only catch here is if you setup an offline computer with the same version -- for the first time in two years, the offline transaction message format has changed, so this version is no longer backwards compatible with an offline computer running an older system. With regards to offline computers, as long as both systems are running pre-0.90 or 0.92+, you'll be fine. If you're not even using the offline feature, then this doesn't matter.
We should have another testing release this weekend. You can safely upgrade then and be free of these issues
![Smiley](https://bitcointalk.org/Smileys/default/smiley.gif)