hi,
sierra's not compatible with older software, but adobe's posted a work-around: https://helpx.adobe.com/creative-cloud/kb/install-creative-suite-mac-os-sierra.html
while the counterfeit issue isn't mentioned at the link, it's worth a try. if that fails, download* an installation file from adobe (if your serial number is for a single-user).
if that fails using a browser that allows popups and cookies, contact adobe support during pst business hours by clicking here and, when available, click 'chat', https://helpx.adobe.com/contact.html
*
Single user licensee downloadable installation files available:
- Suites and Programs: CC 2017 | CC 2015.5 | CC 2015 | CC 2014 | CC | CS6 | CS5.5 | CS5 | CS4, CS4 Web Standard | CS3
- Acrobat: DC, XI, X | X Suite | 9,8 | 9 pro extended exe,9 pro extended 7z | 9 standard | 8 standard |
- Authorware: 7.01 windows |
- Captivate: 10 (2017) | 9 | 8 | 7 | 6 | 5.5, 5 | 1
- Cold Fusion: 11, 10 | 9.0.2, 9.0.1, 9.0.0, 8.0.1, 8.0.0, 7.0, 6.1, 6.0, 5.0, 4.0 |
- Contribute: CS5 | CS4, CS3 | 3,2
- FrameMaker: 12, 11, 10, 9, 8, 7.2 |
- Lightroom: 6.13| 5.7.1| 4.4 | 3.6 | win 2.7, 1.4.1 | mac 2.7, 1.4.1 |
- Photoshop Elements: 2018,15,14,13,12,11,10,9,8 | 9,8,7 win | 8 mac | 7 mac
- Premiere Elements: 2018,15,14,13,12,11,10,9,8| 9, 8, 7 win | 8 mac | 7 mac
- RoboHelp: 2015, 11, 10, 9, 8
Updates
And a big thank you to Jim @ Prodesigntools for helping me with these links!