Hi Larry,
Thanks for trying out Site Updates Report.
Just to confirm, is the alert you’re seeing “You have unsaved changes. Please save changes first.” or solely “You have unsaved changes”?
If the former, this is a check that looks at all the fields on the page to ensure there aren’t any changes that still need to be saved. Without saving those changes, actions such as Send Report, Preview, or Download PDF would use the previously saved data.
What happens when you click Save Changes at the bottom of the page and then immediately click one of those buttons after the page has saved?
If you still receive the error, could you try to replicate it on our demo site:
https://wordpress.org/plugins/site-updates-report/?preview=1
If you’re able to replicate it there, please send me the steps you took to reproduce the issue so I can investigate it further.
Thank you,