Here's my way around having to have a password. I created a password for the local user account and used that to create the blueiris service. I then edited the service to use the local system account and started the service. I then removed the local user account's password. Did a reboot and settings survived.
You can use this How to remove your login password from Windows 10
The password will still be required by the service and other functions like windows remote desktop, it just eliminates the need to enter it locally.
You can use this How to remove your login password from Windows 10
The password will still be required by the service and other functions like windows remote desktop, it just eliminates the need to enter it locally.