Here what I am doing when i uodating some of my clients. I keep in different place an empty database with empty tables. When I need to change some fields in tables I do it there & after that I am updating my development DB. ALL Incrementa fields are normaly Interger fields (not autoinc). During update I APPEND FROM table & right after that & Do:

USE NewTableWithoutIncFields EXCLUSIVE && To make sure that nobody has access to that table
ALTER TABLE NewTableWithoutIncFields ALTER COLUMN AutoIncField
SELECT NewTableWithoutIncFields
SET ORDER TO ThatFileldThatIsAutoInc
GO BOTTOM
next_key = AutoIncField+1
ALTER TABLE NewTableWithoutIncFields ALTER COLUMN AutoIncField I AUTOINC NEXTVALUE next_key
USE
ERASE NewTableWithoutIncFields.BAK
* ERASE NewTableWithoutIncFields.TBK  If table has MEMO field
*COPY or whatever You want to do with it

>I send an upgrade that include .exe file and a programa that execute Gendbc from a forder, it create an exactly copy of the database and table structures that I have and make a APPEND FROM, replacing old tables with new ones. Everything have been working fine until I decided to use AutoIncremental fields.
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>>I do such things too. But sorry I can't see how GenDbc gets into play on remote site. Wouldn't you use gendbc at deveoper side?
>>Cetin