I found 1.0, a German release, and German Turbo Toolbox here:

https://archive.org/details/000376-BorlandTurboBasic10>

https://archive.org/details/BorlandTurboBasic1.0German

https://archive.org/details/turbotoolbox

In the time I was willing to spend, I did not see a 1.1 release.