Hi, welcome to justanswer.com! My name is Mike.I am going over your question and I will be with you shortly.
Can you clarify what is "last pass"?
Try this link if you mean the LastPass password ***** software: https://lastpass.com/download/cdn/lpmacosx.zip
It will download a file called lpmacosx.zip double click on that to expand it.
Did you do that?