They changed their tournament hand history format. We should have a new beta update pushed out soon to try and fix this.
You will receive a prompt to update HM3 any time there is an update available as long as you have enabled the Tools - Settings - General - [x] 'Check for Updates' and [x] 'Prompt for beta updates' options. You can check for new updates via the HM3 - Help - 'Check for updates...' option. You can also check for updates and release notes in
our HM3 Releases forum or in
our Release Notes FAQ.