You can only get The Roku Channel on your computer. Any other "channels" that were available on your Roku would have to have another way to view them on a computer that has nothing to do with Roku. A computer isn't a substitute for a Roku device. What is your subscription for? You can manage your subscriptions paid through Roku at https://my.roku.com/account/subscriptions. If you paid directly to some provider then you'd have to go through them.
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