What happened to RStudio version 1.3.11 ?
Now, a newest version is 1.2.1268 ?
The 1.3 builds are still being produced, but we've taken them off the dailies.rstudio.com page because they really aren't ready for anyone to use yet. They'll be back once 1.3 has stabilized a little more.
I installed it, should I go back and install 1.2.1268 ?
Up to you, but there won't be any new 1.3 builds published for a while so recommend returning to the 1.2 branch next time you have time to update.