I use a Windows 7 computer, in conjunction with purchased editions of LR 5.6 and PS CS5. I import via Lightroom where I import and convert to DNG for the version going into the LR catalogue, and simultaneously produce backups as CR2 that sit on an external drive. I've always been able to open the CR2 into ACR in situ , but in January this year I changed from a 5dii to a 5Diii. The versions I hold as DNG open successfully in Lightroom. But the CR2 made on the new camera on the external drive won't open and the dialog box indicates (and I'm paraphrasing) that it looks like the newer CR2 have been made on a camera unsupported by my current version of ACR. I'm unsurprised by this for as I say, I've started using a different camera. I presume I need to install a more up-to-date version of ACR. Problem is I don't know where and how. I can't seem to find a new-ish ACR (eg 7.1) on Adobes download site and I get advise to install their download manager. However all that seems to want to do is install a trial version of CC, which isn't the way I really want to go for the time being at least. Is there another way I can get a more up-to-date ACR whilst not doing that? Equally I know I could resolve the problem going forward by setting LR to make the backup copy as a DNG too. But that doesn't help with my 2015 raw backups and I guess I imagined that holding the raw files in two different formats (DNG and CR2) might turn out to be a useful security measure in time. So that route- which in any case doesn't help my "2015" problem hasn't really been my preferred route.