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:
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