I was trying to install 4.50 update 7 and it started to merge files and then came back with Error 65: Install method failed with the following error: error 65 at line 1062 of SY_installation.pvc. After well over an hour on the phone with Sage, we discovered that the CM folder was missing all but one file. So, we think the install was trying to write the updates to files in CM that were missing. Restored the backup so they can get payroll done and then we will upgrade.