I keep trying to install the trial version of Photoshop CS6 on my macbook pro (version 10.6.8) and I was able to download it fine from the download assistant. Once I tried installing it, however I kept coming up with the same error. First it says that the images couldn't be opened because of an invalid checksum, then if I opt to skip that step it comes up with a window letting me install it which I do but once it hits 44% it jumps to 99% and says installation failed due to an inauthentic certificate, saying "Adobe Genuine Software Verification Failure."
How do I fix this???
Sounds like your download got corrupted. You can try downloading it again.