Installating error

Hello!

I try to install SIFRank, but I have error:

"No module named 'allennlp.commands.elmo'"

Do you know, what can I do with it? 

I read that the current version of allennlp does not contain the elmo.py file, and whan i try to install previous version, i have error too. 

I will be grateful for the help because SIFRank is very interested me.