LUT Buddy won’t install for CC2015?

[Chris Wright]

this is the compatibility list from red giant directly.

APPLE MACINTOSH
Mac OS X 10.8 and later

PC / WINDOWS
Windows 7 64-bit
Windows 8 64-bit
Windows 10 64-bit

if it does match your system, it might be a permissions issue.
this now looks like a red giant support ticket issue for install: click create a support ticket
https://www.redgiant.com/support/faq/product-specific/lut-buddy/248/