I'm in no way a trainers expert but they look okay. I've seen people on here buy blister socks , so I wonder if they would help. Also it's strange you're only getting blisters now after wearing them since July.
If you take 15k a week for the last 20 weeks, that would be 300k. Typically shoes last about 300-400 miles, so i'd say you've got a little more life in them yet, but probably worth starting to think about what you'd replace them with, especially if you also did your c25K in them.
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