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User tries to start engines via the start-suite script.
Checkengine script displays an error of the following type:
On examining the db_** log for the relevant engine, you see an error of the following type:
2016-10-24 21:05:48 [CH1] {channels43.kdb ,6713} () FATAL .a.db "migration.kr: file not found"
The migration directory present in <APPIAN_HOME>/server/*engine* directory is missing due to accidentally deleting or moving it to a different location.
<APPIAN_HOME>/server/*engine*
Re-install Appian and test the install/upgrade again.