TRANSPOSITION NOT ABOLISHMENT
 
The English translations are not very accurate.  Below is the proper translation of the "Change" that occured in The Law in Hebrews 7:12.  The word translated "change in the Law" in Hebrews 7:12 is Greek word #3331 in Strong's.  If you look this word up, the proper translation and meaning of this word is NOT "change" it is "transfer to Heaven"... transposition.
 
In context, this scripture is explaining the superiority of the Spiritual Melchizedek Priesthood over the physical portrait and human priesthood of Levi.  The Levitical Priesthood was given to help us understand physically what Yahshua would do Spiritually as High Priest before YHWH (physical to spiritual parallels).  And given the final High Priest has come and taken His position as the King of Righteousness or Melchizedek... the human priesthood of Levi was TRANSFERRED over to Melchizedek and so was the Law by which the priesthood has authority to make atonement!  Below is how Hebrews 7:12 should have been translated:
Hebrews 7:12
"for when there is a transfer of the priestly office (of Levi to Melchizedek), out of necessity there is ALSO A TRANSFER of the LAW of the priesthood (by which the Priesthood has authority)"
In other words, now Yahshua is the High Priest and has all the duties and authority provided Him by the Law of YHWH concerning sacrifices and atonement.  Both the priesthood and the Law that governs it was transferred to Melchizedek (Yahshua) not abolished.  Both the High Priesthood and The Law were "transferred to heaven" or transposed.
 
Hebrews 7:12 where it says "change in the Law" is a mistranslation used to assist Roman Catholicism and Christianity to do away with the Law of YHWH.  The correct translation of the Greek word  metaqesiV is "transfer to heaven".  Meaning both the Law which governs and defines the sacrifices made by the High Priest as well as the High Priesthood was transferred to Heaven with Yahshua... NOT abolished.  Below is the Strong's entrance... the word metathesis means "transposition" or a transfer of position in this case to heaven.
 
3331 metaqesiV
metathesis
met-ath'-es-is
from metatiqhmi - metatithemi 3346; transposition, i.e. transferral (to heaven), disestablishment (of a law from physical to spiritual):--change, removing, translation.