If there are errors when running a Flow install (new or upgrade version) there are logs written that may provide helpful information.
C:\ProgramData\Microsoft Corporation\Windows Installer - Unicode\logs
Sample Install Log Excerpt
2024-05-20 14:27:26.133 Info: OnBeforeInstall: Bannister Lake - Flow for Chameleon 2024-05-20 14:27:26.135 Info: Check database connection: localhost:3306 root 2024-05-20 14:27:26.298 Info: Database connection valid? True 2024-05-20 14:27:59.406 Info: Commit: 2024-05-20 14:27:59.406 Info: TargetSite is set to: /LM/W3SVC/1 2024-05-20 14:27:59.406 Info: Check binds and site Url Host Name: 2024-05-20 14:27:59.840 Info: Is Http Enabled: True 2024-05-20 14:27:59.841 Info: Is HTTPS Enabled: True 2024-05-20 14:27:59.841 Info: Site Url Host Name: localhost 2024-05-20 14:27:59.841 Info: Read config service file: servicesHttpBoth 2024-05-20 14:27:59.842 Info: Write config service file: in Configurations folder. ... 2024-05-20 14:28:01.647 Info: Check if the preference already exists for `Flow` `Theme` 2024-05-20 14:28:01.648 Info: Database update engine run finished. 2024-05-20 14:28:01.648 Info: Read the update report at: https://localhost/tickit/Uploads/InstallReport.htm