OriginalPostID-215548
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Hi sonamg
Old folder kdbs.
If all the engines are showing the FATAL status, that due to some other reason i.e., Some went wrong.(Start doing from the beginning with fresh installation)
If you are upgrading the your Appian, make sure you are following update guide and also you are using the same primary data source.
Suppose for example if you want to repair the process execution engine kdbs, Please fine the below steps(Assume my Appian is in C:/ drive.)