Massachusetts registration tallies are issued very infrequently, only twice in election years. The Secretary of State has posted the October 17, 2018 tally. See it here. It does not include the totals for the parties that were not qualified in advance of the election. Therefore, it only has Democratic, Republican, Libertarian, and independent/miscellaneous. BAN is attempting to get the new figures for the unqualified parties.
The new percentages are: Democratic 33.11%; Republican 10.30%; Libertarian .35%; independent and miscellaneous 56.24%.
The last tally, for August 15, 2018, was: Democratic 33.22%; Republican 10.37%; Libertarian .32%; independent and miscellaneous 56.10%.