To answer to your questions:
Yes you are right, you don’t need to have a fresh installation
but just do an upgrade. You can have more information in the install guide page
64:
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6.4 OS/400 Interactive
Update
In general, Dollar Universe
updates are available on the FTP site
The modifications made by the
update are listed in the associated readme file.
For each
update, the procedure "Installation of an Update" below must be
applied where nnnnn is replaced by the update number.
6.4.2 Installation of an
Update
The kit must be decompressed on
the Windows platform and then transferred by FTP to the OS/400 system in binary
mode.
Create the restoration library
FXnnnnn:
CRTLIB
FXnnnnn
Create the reference to the
SAVF file in the FXnnnnn library:
CRTSAVF
FXnnnnn +F4
Visualize
the members contained in the SAVF with command DSPSAVF. Note the
original library.
Restore the
member with the following command (it is required to press F4 and then F10 to
modify the parameters “Database option member” on *ALL instead of *MATCH and
“Admit object difference” on *ALL instead of *NONE):
RSTOBJ
OBJ(*ALL ) SAVLIB(FXnnnnn) DEV(*SAVF) SAVF(INSTALL/FXnnnnn)
ADDLIBLE
LIB(FX2nnnnn)
Install the update:
UPGRADE
+F4
You can
restart the sub-system and the Company after all the updates have been applied.
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Let us know if you have more questions :)