problems with updating the unity and download all versions (internet connection lost) error re-connect

Look, I 'm with an urgent problem.

well, I have a personal version edition of unity . however when I download any version ( the latest for example) , you see a dialog box where you hear says a missed connection and appears two options or retry or cancel , I click retry and reappears the same post . I can not do the update . My current version is 5.3.2.f1 . and I always made updates to the latest vesão . however now I can not anymore.

please, I have a project to finish where I would use one of the new features of the new pach .

if anyone have a solution please contact me . ( And no, not connection problem , and neither of memory ram or HD )

---- If I wrote wrong , it was because I used tranlate google -----