Greatest feature idea for Adobe XD

Please let us save our XD file on an oldest version. 

Explaining my case:

I had my prototype that was working properly. You guys made the update, now I can´t work.

I noticed sometime later that my issue was the update. 

I tried to revert Adobe XD to the latest stable version.

I cannot open my file there anymore because I saved it on an updated version. 

Now I have 2 options: Wait you guys to fix my issue.

Redo my 7months prototype in another tool. 

I wish I have a third option:

Save my XD file in an older version and come back to work.