I just had a similar error re-installing Version 2016 PU 2, not all the modules appeared on the menu, went to reinstall and received a Prepare failed with the following error: No error message was given. Article on Knowledge Base 106236 had a fix, I had to remove keys related to the payroll Module in the Sy_ConversionDriver.m4t file. May not be the same issue though the article might be worth the read.