I have Pro Plus 6.4.3 running perfectly on my old iMac as you can see below...
http://i65.tinypic.com/2z670vk.jpg
The only gripe I have is that Simulation Curriculum give almost no notification whatsoever of any updates [This page alone bears testimony to it...SP6 is already at v6.4.3 but the "latest" version on MU is 6.2.3]
I have managed to compile a list of the various v6 Pro and Pro Plus updates (as well as their respective release dates) that are available as at June 19th 2011:
STARRY NIGHT PRO 6 UPDATES
(6.0.1 to 6.4.3)
Starry Night Pro 6 v6.0.1 Update (Mac) (200610123)
http://www.siennasoft.com/updates/up...ro%206.0.1.zip
Starry Night Pro 6 v6.0.1 Update (Win) (200610123)
http://www.siennasoft.com/updates/up...ro%206.0.1.exe
Starry Night Pro 6 v6.0.3 Update (Mac) (20061221)
http://www.siennasoft.com/updates/up...ro%206.0.3.zip
Starry Night Pro 6 v6.0.1 Update (Win) (200610123)
http://www.siennasoft.com/updates/up...ro%206.0.3.exe
Starry Night Pro 6 v6.0.4 Update (Mac) (20070112)
http://www.siennasoft.com/updates/up...ro%206.0.4.zip
Starry Night Pro 6 v6.0.4 Update (Win) (20070112)
http://www.siennasoft.com/updates/up...ro%206.0.4.exe
Starry Night Pro 6 v6.0.6 Update (Mac) (2007mmdd) (LINK NO LONGER WORKS)
http://images.starrynight.com/suppor...ro%206.0.6.zip
Starry Night Pro 6 v6.0.6 Update (Win) (2007mmdd) (LINK NO LONGER WORKS)
http://images.starrynight.com/suppor...ro%206.0.6.exe
Starry Night Pro 6 v6.2.0 Update (Mac) (20071106)
http://www.starrynight.com/support/u...ro%206.2.0.zip
Starry Night Pro 6 v6.2.0 Update (Win) (20071106)
http://www.starrynight.com/support/u...ro%206.2.0.exe
Starry Night Pro 6 v6.2.1 Update (Mac) (20071123)
http://www.starrynight.com/support/u...ro%206.2.1.zip
Starry Night Pro 6 v6.2.1 Update (Win) (20071123)
http://www.starrynight.com/support/u...ro%206.2.1.exe
Starry Night Pro 6 v6.2.3 Update (Mac) (20080306)
http://www.starrynight.com/support/u...ro%206.2.3.zip
Starry Night Pro 6 v6.2.3 Update (Win) (20080306)
http://www.starrynight.com/support/u...ro%206.2.3.exe
Starry Night Pro 6 v6.3.3 Updater (Mac) (20090723)
http://www.starrynightsupport.com/up...%20Updater.zip
Starry Night Pro 6 v6.3.3 Updater (Win) (20090723)
http://www.starrynightsupport.com/up...%20Updater.exe
Starry Night Pro 6 v6.3.3 to 6.3.6 Updater (Mac) (20091002)
http://www.starrynightsupport.com/up...%20Updater.zip
Starry Night Pro 6 v6.3.3 to 6.3.6 Updater (Win) (20091002)
http://www.starrynightsupport.com/up...%20Updater.exe
Starry Night Pro 6 v6.3.3 to 6.3.9 Updater (Mac) (20100426)
http://www.starrynightsupport.com/up...%20Updater.zip
Starry Night Pro 6 v6.3.3 to 6.3.9 Updater (Win) (20100426)
http://www.starrynightsupport.com/up...%20Updater.exe
Starry Night Pro 6 v6.3.3 to 6.4.1 Updater (Mac) (20101223)
http://www.starrynightsupport.com/up...%20Updater.zip
Starry Night Pro 6 v6.3.3 to 6.4.1 Updater (Win) (20101223)
http://www.starrynightsupport.com/up...%20Updater.exe
Starry Night Pro 6 v6.3.3 to 6.4.3 Updater (Mac) (20110120)
http://www.starrynightsupport.com/up...%20Updater.zip
Starry Night Pro 6 v6.3.3 to 6.4.3 Updater (Win) (20110120)
http://www.starrynightsupport.com/up...%20Updater.exe
STARRY NIGHT PRO PLUS 6 UPDATES
(6.0.1 to 6.4.3)
Starry Night Pro Plus 6 v6.0.1 Update (Mac) (200610123)
http://www.siennasoft.com/updates/up...us%206.0.1.zip
Starry Night Pro Plus 6 v6.0.1 Update (Win) (200610123)
http://www.siennasoft.com/updates/up...us%206.0.1.exe
Starry Night Pro Plus 6 v6.0.3 Update (Mac) (20061221)
http://www.siennasoft.com/updates/up...us%206.0.3.zip
Starry Night Pro Plus 6 v6.0.3 Update (Win) (20061221)
http://www.siennasoft.com/updates/up...us%206.0.3.exe
Starry Night Pro Plus 6 v6.0.4 Update (Mac) (20070112)
http://www.siennasoft.com/updates/up...us%206.0.4.zip
Starry Night Pro Plus 6 v6.0.4 Update (Win) (20070112)
http://www.siennasoft.com/updates/up...us%206.0.4.exe
Starry Night Pro Plus 6 v6.0.6 Update (Mac) (2007mmdd) (LINK NO LONGER WORKS)
http://images.starrynight.com/suppor...us%206.0.6.zip
Starry Night Pro Plus 6 v6.0.6 Update (Mac) (2007mmdd) (LINK NO LONGER WORKS)
http://images.starrynight.com/suppor...us%206.0.6.exe
Starry Night Pro Plus 6 v6.2.0 Updater (Mac) (20071106)
http://www.starrynight.com/support/u...us%206.2.0.zip
Starry Night Pro Plus 6 v6.2.0 Updater (Win) (20071106)
http://www.starrynight.com/support/u...us%206.2.0.exe
Starry Night Pro Plus 6 v6.2.1 Updater (Mac) (20071123)
http://www.starrynight.com/support/u...us%206.2.1.zip
Starry Night Pro Plus 6 v6.2.1 Updater (Win) (20071123)
http://www.starrynight.com/support/u...us%206.2.1.exe
Starry Night Pro Plus 6 v6.2.3 Updater (Mac) (20080306)
http://www.starrynight.com/support/u...us%206.2.3.zip
Starry Night Pro Plus 6 v6.2.3 Updater (Win) (20080306)
http://www.starrynight.com/support/u...us%206.2.3.exe
Starry Night Pro Plus 6 v6.3.3 Updater (Mac) (20090723)
http://www.starrynightsupport.com/up...%20Updater.zip
Starry Night Pro Plus 6 v6.3.3 Updater (Win) (20090723)
http://www.starrynightsupport.com/up...%20Updater.exe
Starry Night Pro Plus 6 v6.3.3 to 6.3.6 Updater (Mac) (20091002)
http://www.starrynightsupport.com/up...%20Updater.zip
Starry Night Pro Plus 6 v6.3.3 to 6.3.6 Updater (Win) (20091002)
http://www.starrynightsupport.com/up...%20Updater.exe
Starry Night Pro Plus 6 v6.3.3 to 6.3.9 Updater (Mac) (20100426)
http://www.starrynightsupport.com/up...%20Updater.zip
Starry Night Pro Plus 6 v6.3.3 to 6.3.9 Updater (Win) (20100426)
http://www.starrynightsupport.com/up...%20Updater.exe
Starry Night Pro Plus 6 v6.3.3 to 6.4.1 Updater (Mac) (20101223)
http://www.starrynightsupport.com/up...%20Updater.zip
Starry Night Pro Plus 6 v6.3.3 to 6.4.1 Updater (Win) (20101223)
http://www.starrynightsupport.com/up...%20Updater.exe
Starry Night Pro Plus 6 v6.3.3 to 6.4.3 Updater (Mac) (20110120)
http://www.starrynightsupport.com/up...%20Updater.zip
Starry Night Pro Plus 6 v6.3.3 to 6.4.3 Updater (Win) (20110120)
http://www.starrynightsupport.com/up...%20Updater.exe
