Facing error 1618 while updating Quickbooks Pro 2015
You should follow the below steps that can definitely help you to resolve error 1618 while updating Quickbooks :
Step 1: Go to Task Manager
Step 2: Click on Processes Tab
Step 3: Right Click on MSIEXEC.EXE & Click on End Task
Step 4: Restart the Computer
Step 5: Open QuickBooks & Install Updates
While following the above steps I had taken help from my son who is good at computers. In case you are a tech-savvy person you should be able to resolve this concern else I recommend to consult a Certified QB ProAdvisor.