Computer not taking updates. Can't install CC

I found out only after purchasing the product that my computer's update center is corrupted and therefor I can't actually install the product. Reason being, I'm operating on windows 8.1, so I can't do the necessary update needed to run it, and I couldn't upgrade to window 10 because it was considered an update as well. I am still trying to fix the issue, but I didn't know if there was any way to cancel my subscription without having to pay the remaining months, where I haven't even been able to use the product, and it's unlikely I will be able to for a while.