Hello @alanshao,
Thank you for taking the time to ask your question on the StarTech.com website.
Regarding your first question. The “Printer Support List” for our printer servers is not exhaustive. So many standard printer models will work fine. The printing function on multifunction printers may work, but other features will not.
I am sorry about the trouble with the installation method in the manual. There are a few other ways that the PM1115UW can be set up. These are listed here on the StarTech.com community page.
https://community.startech.com/t/how-do-i-install-pm1115uw-on-windows-or-macos/776/1
The guide here may be similar to the one in the manual. A PDF guide linked at the top with other methods to try, including a manual installation method. Be sure to take note of the manual LPR setup steps.
Please let me know if those instructions are helpful, or if you run into any further issues and I will be happy to investigate further with you.
Sincerely,