"At later" sounds very strange to me. We don't say that. In that sentence, it is best to say: "No, I haven't, but I will watch it later this week." Sometimes we say "at a later time" or "at a later date". For example: "No, I haven't, but I will watch it at a later date." "No, I haven't, but I will watch it at a later time." This means that they don't know when EXACTLY they will watch it, but they plan on watching it sometime in the future.

Hi Roman, I would say, "I will watch it later this week" or I will watch it at a later time this week." You're trying to use "later" as an adjective here, but in this case you don't have a noun to describe "later." By itself, "At later" is not grammatical.

Hi, the correct way of saying your sentence is this way: " I will watch it later " ... you can't say " at later " It's not correct to say "at later"

I'll watch it later. Correct. I'll watch it later, when I get home. I'll look at the paper later. (Read it later).