iMac iPhone update question
I have an older iMac running 10.13.6 high sierra OS I’m wanting to download some photos from an iPhone into a created folder. However, my iMac is telling me that in order for me to do that I need to update my iPhoto. When I try to do that, it’s telling me that it was either refunded or purchased under a different Apple ID. I purchased the computer used from an individual, so how do I update my photo app so I can back up my photos
iMac 21.5″, macOS 10.13