Thank you for purchasing and using our products.
This is to inform that the SIGMA Photo Pro 6.5.4 for Macintosh is not compatible with the Mac OS X 10.13 (High Sierra), which is newly released by Apple.
At the moment, we are working on the development of the SIGMA Photo Pro 6.5.5 for Macintosh. Once the compatible software becomes available, we are going to make further announcement.
For further assistance please contact Sigma Imaging (UK) Ltd Service Department by emailing firstname.lastname@example.org or telephoning 01707 329 999