Updating process via Sparkle works/doesn't work

Hi, I just successfully updated to 3.2.1 on my laptop but on the iMac got this message:

I don’t know what is different between the two machines, both running El Capitan. I assume it’s a permissions issue, but El Capitan doesn’t allow you to fix permissions. Has anyone else run into this or know what’s going on?

Thanks,
David

I haven’t seen this reported before. You might try to delete the folder at /Users/dhm/Library/Caches/com.hogbaysoftware.TaskPaper3 and try again?

Thanks, will try this.