We have stopped creating new versions of Praat for SPARC Solaris. If you have a SPARC Solaris workstation, you can still create a new version yourself directly from the source code. The last version that we did create was 4.3:
Unpack with gunzip and tar xvf. This will create the executable file praat. You can remove the tar file.
Some computers have a bug in their audio device that causes you to hear a click sound before and after playing a sound in Praat. To minimize the distracting effect of this, you could tell Praat to play a silence before and after every played sound. See the command "Sound output prefs" under "Preferences" in the "Control" menu.