Slightly confused, the data is only for 1 year, but in the ACS tables list it has 1,5 So I just assume that is a typo in the tables list. Its not that there should also be 5 year data.
As a side note, I'm trying to figure out total ACS-5 fields (counting all tables). I think its 115,304 which is no small number. I took me a little effort and I am sure the R people out there could get in in 2 min. Hopefully, I'm in the ballpark.