For help with any GC3 issues, please first review our support FAQ.
https://forums.galciv3.com/486732/galactic-civilizations-iii-support-faq
Below is a compiled master list, complete with links, to of all of the releases thus far for GC3:
Galactic Civilizations III: 4.21
--RELEASED 12/15/2021--
https://forums.galciv3.com/508572/
Galactic Civilizations III: 4.2
--RELEASED 08/05/2021--
https://forums.galciv3.com/505919/
Galactic Civilizations III: 4.1
--RELEASED 03/11/2021--
https://forums.galciv3.com/503249/
Galactic Civilizations III: 4.01
--RELEASED 06/18/2020--
https://forums.galciv3.com/500142/
Galactic Civilizations III: 4.00
--RELEASED 05/12/2020--
https://forums.galciv3.com/499315/
Galactic Civilizations III: 3.96
--RELEASED 11/07/2019--
https://forums.galciv3.com/497430/
Galactic Civilizations III: 3.95
--RELEASED 10/10/2019--
https://forums.galciv3.com/497163/
Galactic Civilizations III: 3.9 - Hot-patch #2
--RELEASED 9/6/2019--
https://forums.galciv3.com/496804/
Galactic Civilizations III: 3.9 - Hot-patch
--RELEASED 8/28/2019--
https://forums.galciv3.com/496717/
Galactic Civilizations III: 3.9
--RELEASED 8/27/2019--
https://forums.galciv3.com/496653/
Galactic Civilizations III: 3.8
--RELEASED 8/8/2019--
https://forums.galciv3.com/496231/
Galactic Civilizations III- 3.7 - Hot-patch
--RELEASED 7/8/2019--
https://forums.galciv3.com/495057/
Galactic Civilizations III- 3.7
--RELEASED 5/14/2019--
https://forums.galciv3.com/494665/
Galactic Civilizations III- 3.6
--RELEASED 3/14/2019--
https://forums.galciv3.com/493948/
Galactic Civilizations III: Retribution - 3.5 - Hot-patch
--RELEASED 3/4/2019--
https://forums.galciv3.com/493612/
Galactic Civilizations III: Retribution - 3.5
--RELEASED 2/21/2019--
https://forums.galciv3.com/493605/
Galactic Civilizations III - 3.2
--RELEASED 12/12/2018--
https://forums.galciv3.com/492210/
Galactic Civilizations III- 3.1
--RELEASED 12/11/2018--
https://forums.galciv3.com/491932/
Galactic Civilizations III - 3.05
--RELEASED 10/1/2018--
https://forums.galciv3.com/489799/
Galactic Civilizations III - 3.04
--RELEASED 6/26/2018--
https://forums.galciv3.com/489617/
Galactic Civilizations III - 3.03
--RELEASED 6/5/208--
https://forums.galciv3.com/489200/
Galactic Civilizations III - 3.02
--RELEASED 5/21/2018--
https://forums.galciv3.com/488918/
Galactic Civilizations III - 3.01
--RELEASED 4/17/2018--
https://forums.galciv3.com/488580/
Galactic Civilizations III - 3.0
--RELEASED 4/11/2018--
https://forums.galciv3.com/488245/
Galactic Civilizations III - 2.8
--RELEASED 2/8/2018--
https://forums.galciv3.com/486887/
Galactic Civilizations III - 2.71
--RELEASED 12/20/2017--
https://forums.galciv3.com/486559/
Galactic Civilizations III - 2.7
--RELEASED 12/14/2017--
https://forums.galciv3.com/486366/
Galactic Civilizations III: Crusade - 2.6
--RELEASED 10/12/2017--
https://forums.galciv3.com/485102
Galactic Civilizations III: Crusade - 2.5
--RELEASED 9/12/2017--
https://forums.galciv3.com/484888
Galactic Civilizations III: Crusade - 2.33
--RELEASED 8/10/2017--
https://forums.galciv3.com/484539
Galactic Civilizations III: Crusade - 2.32
--RELEASED 8/1/2017--
https://forums.galciv3.com/484291
Galactic Civilizations III: Crusade - 2.31
--RELEASED 6/29/2017--
https://forums.galciv3.com/483968
Galactic Civilizations III / Crusade - 2.3
--RELEASED 6/19/2017--
https://forums.galciv3.com/483664
Galactic Civilizations III:Crusade - 2.21
--RELEASED 6/1/2017--
https://forums.galciv3.com/483419
Galactic Civilizations III:Crusade - 2.2
--RELEASED 5/24/2017--
https://forums.galciv3.com/483089
Galactic Civilizations III:Crusade - 2.13
--RELEASED 5/11/2017--
https://forums.galciv3.com/483069
Galactic Civilizations III:Crusade - 2.11
--RELEASED 5/8/2017--
https://forums.galciv3.com/482980
Galactic Civilizations III:Crusade
--RELEASED 5/4/2017--
https://forums.galciv3.com/481342
Galactic Civilizations III - 2.0
--RELEASED 1/26/2017--
https://forums.galciv3.com/481461
Galactic Civilizations III - 1.9 MEGA Patch - Hotpatch
--RELEASED 12/19/2016--
https://forums.galciv3.com/481075
Galactic Civilizations III - 1.9 MEGA Patch
--RELEASED 12/13/2016--
https://forums.galciv3.com/480906
Galactic Civilizations III - 1.83
--RELEASED 10/26/2016--
https://forums.galciv3.com/480071
Galactic Civilizations III - 1.82
--RELEASED 8/22/2016--
https://forums.galciv3.com/479195
Galactic Civilizations III - 1.81
--RELEASED 7/26/2016--
https://forums.galciv3.com/478793
Galactic Civilizations III - 1.8
--RELEASED 6/14/2016--
https://forums.galciv3.com/477869
Galactic Civilizations III - 1.71
--RELEASED 5/17/2016--
https://forums.galciv3.com/477459
Galactic Civilizations III - 1.7
--RELEASED 4/21/2016--
https://forums.galciv3.com/475888
Galactic Civilizations III - 1.61
--RELEASED 3/3/2016--
https://forums.galciv3.com/475641
Galactic Civilizations III - 1.6 - Mercenaries
--RELEASED 2/18/2016--
https://forums.galciv3.com/475427
Galactic Civilizations III - 1.5.1
--RELEASED 12/22/2015--
https://forums.galciv3.com/474231
Galactic Civilizations III - 1.5 - Precursor Worlds DLC
--RELEASED 12/9/2015--
https://forums.galciv3.com/473036/page/1/
Galactic Civilizations III - 1.4.1
--RELEASED 11/5/2015--
https://forums.galciv3.com/472980/page/1/
Galactic Civilizations III - 1.4
--RELEASED 10/29/2015--
https://forums.galciv3.com/472339/page/1/
Galactic Civilizations III - 1.3.2
--RELEASED 10/1/2015--
https://forums.galciv3.com/471767/page/1/
Galactic Civilizations III - 1.3.1
--RELEASED 09/17/2015--
https://forums.galciv3.com/471484/page/1/
Galactic Civilizations III - 1.3 - DLC Revenge of the Snathi
--RELEASED 09/10/2015--
https://forums.galciv3.com/470717/page/1/
Galactic Civilizations III - 1.2.1
--RELEASED 08/25/2015--
https://forums.galciv3.com/470715/page/1/
Galactic Civilizations III - 1.2 - DLC Mega Events
--RELEASED 08/11/2015--
https://forums.galciv3.com/469866/page/1/
Galactic Civilizations III - 1.12
--RELEASED 07/22/2015--
https://forums.galciv3.com/468492/page/1/
Galactic Civilizations III - 1.11
--RELEASED 07/10/2015--
https://forums.galciv3.com/468302/page/1/
Galactic Civilizations III - 1.10 - DLC Map Pack
--RELEASED 07/9/2015--
https://forums.galciv3.com/467453/page/1
Galactic Civilizations III - 1.03
--RELEASED 06/8/2015--
https://forums.galciv3.com/466812/page/1/
Galactic Civilizations III - 1.02
--RELEASED 06/1/2015--
https://forums.galciv3.com/466354/page/1/
Galactic Civilizations III - 1.01
--RELEASED 05/21/2015--
https://forums.galciv3.com/465513/page/1/
Galactic Civilizations III - 1.0
–RELEASED 05/14/2015–
https://forums.galciv3.com/465235/page/1/
Galactic Civilizations III - Beta 6 - Patch 2
–RELEASED 05/11/2015–
https://forums.galciv3.com/464667/page/1/
Galactic Civilizations III - Beta 6 - Patch 1
–RELEASED 05/4/2015–
https://forums.galciv3.com/464200/page/1/
Galactic Civilizations III - Beta 6 - Opt In
–RELEASED 05/1/2015–
Galactic Civilizations III - Beta 5 Patch 3
–RELEASED 04/17/2015–
Galactic Civilizations III - Beta 5 Patch 2
–RELEASED 04/10/15–
Galactic Civilizations III - Beta 5 Patch 1
–RELEASED 04/01/15–
Galactic Civilizations III - Beta 5
–RELEASED 03/26/2015–
Galactic Civilizations III - Beta 4 Patch 2
–RELEASED 02/16/2015–
Galactic Civilizations III - Beta 4 Patch 1
–RELEASED 01/29/2015–
Galactic Civilizations III - Beta 4
–RELEASED 01/22/2015–
Galactic Civilizations III - Beta 3 - Opt In
–RELEASED 12/12/2014–
Galactic Civilizations III - Beta 3
–RELEASED 12/11/2014–
Galactic Civilizations III - Beta 2 Patch 0.51
–RELEASED 10/23/2014–
Galactic Civilizations III - Beta 2
–RELEASED 10/16/2014–
Galactic Civilizations III - Beta 1 Patch 0.42
–RELEASED 9/11/2014–
Galactic Civilizations III - Beta 1 Patch 0.41
–RELEASED 8/21/2014–
Galactic Civilizations III - Alpha Patch 0.30
–RELEASED 6/24/2014–
Galactic Civilizations III - Alpha Patch 0.30 Patch 1
–RELEASED 7/10/2014–
Galactic Civilizations III - Alpha Patch 0.20
–RELEASED 5/7/2014–
Galactic Civilizations III - Alpha Patch 0.0.2.0
–RELEASED 4/3/2014–