The installer in the Intel® Quartus® Prime Pro Edition version 18.1 Update 2 software was updated due to an upgrade of the third-party installation packaging software.
The contents of the installation file are identical, that is the Intel® Quartus® Prime Pro Edition software is identical in both packages.
Intel® Quartus® Prime Software v18.1 Update 2
Old MD5: 1E3994091253504B8550C57731A93231
New MD5: 8C52BD431B9F81C2EB83F77D1D28E4B1
Intel® Quartus® Prime Pro Edition Software Update 2 (Device support included)
Old MD5: 7D46AAF70AC76C052E949D254029053C
New MD5: 917E27E50DEC13D127A28AE24D97F891