It seems there is not a complete english translation available from a single translator, or one affiliated with any university/previous scholarship at least. I couldnt find any in a quick search of a few major city library catalogues and major universities in NA. I did find a few journal articles about the book though, and it was very easy to find other Solzhenitsyn books in grade school and other libraries.

The pdf translation below has a typo in the very first line of the introduction and the first chapter was translated by someone(s) on 8chan {1}. So I'm not terribly surprised that typical public libraries don't have a copy.

{1} https://ia803108.us.archive.org/2/items/200YearsTogether/200...

(side note I love LibGen too, but I think it's good that a physical, public library is making a point of making their e-catalogue available to teens)