The Sapphire Diagnostic Log is a very useful file to have handy when talking to the Boris FX technical support team and can be found in the following directories:
For Sapphire 2024 and older
Adobe
Windows: C:/ProgramData/BorisFX/SapphireAE/sapphire.log
Mac: /Library/Application Support/BorisFX/SapphireAE/sapphire.log
Photoshop
Windows: C:/ProgramData/BorisFX/SapphirePS/sapphire.log
Mac: /Library/Application Support/BorisFX/SapphirePS/sapphire.log
Avid
Windows: C:/ProgramData/BorisFX/SapphireAVX/sapphire.log
Mac: /Library/Application Support/BorisFX/SapphireAVX/sapphire.log
OFX
Windows: C:/ProgramData/BorisFX/SapphireOFX/sapphire.log
Mac: /Library/Application Support/BorisFX/SapphireOFX/sapphire.log
Linux: /opt/BorisFX/SapphireOFX/sapphire.log
For Sapphire 2024.5 and greater
Adobe
Windows: C:\Users\<username\AppData\Local\BorisFX\SapphireAE\sapphire.log
Mac: /Users/<username>/Library/Logs/BorisFX/SapphireAE/sapphire.log
Photoshop
Windows: C:\Users\<username>\AppData\Local\BorisFX\SapphirePS\sapphire.log
Mac: /Users/<username>/Library/Logs/BorisFX/SapphirePS/sapphire.log
Avid
Windows: C:\Users\<username>\AppData\Local\BorisFX\SapphireAVX\sapphire.log
Mac: /Users/<username>/Library/Logs/BorisFX/SapphireAVX/sapphire.log
OFX
Windows: C:\Users\<username>\AppData\Local\BorisFX\SapphireOFX\sapphire.log
Mac: /Users/<username>/Library/Logs/BorisFX/SapphireOFX/sapphire.log
Linux: /Home/<username>/.cache/BorisFX/SapphireOFX/sapphire.log
or /opt/BorisFX/SapphireOFX/sapphire.log