Thanks for reaching out to the Roku community!
I understand that you are unable to install Disney and HBO Max. Where are you currently located?
Please be aware that channel availability/access on Roku devices will vary from region to region. A Roku device will work in any location, however, channels may not be available on your device in that location, based on each channel provider's discretion.
For more information, you'd want to contact any specific channel/service provider to inquire further about whether they offer their channel/service on the Roku platform in your region.
Keep us posted from there if you need additional help.