hi @JFrost ,

If you can open it on 2019, it means 2016  cound't fix your file with standard procedure. QuickBooks 2016 is no longer supported and no patch will be release. You should call support team to get more assistance. If your file is damaged, it is possible you have to pay data recovery service. You may also consider to purchase a 3rd party data recovery service, if you don't have any plan upgrading to 2019 yet.