To install Tidal 1.0.0-pre, first follow the usual install instructions, if you haven't already.
Once that is done, upgrade to the latest development version by running the following in a terminal window:
git clone https://github.com/tidalcycles/Tidal.git tidal-master cd tidal-master cabal install
... and then (re)start your editor.
If you decide to go back to the old version, just uninstall the development version like this:
ghc-pkg unregister tidal-1.0.0