Merge should be ok. Very large caveat with that statement. Without the old Daz installers it's difficult to manually install the daz gen 4 figures to Poser... I've done so without merging but it requires adding all of the delta files and such (which are contained at the top of the library structure in a folder entitled !DAZ) by hand. These files contain morph channel data. If you manage to install manually you then have to run the included DzCreateExPFiles-figure name.bat, which essentially activates the morph channels in the figure. Without running this file the various morph packages will not work.

It's a giant headache if you haven't done it a few times, personally I would not recommend trying it by hand.

I would manually place the contents of the Character, Pose, etc into the library. And the contents of Geometries and Textures likewise. If the !DAZ folder is already present at the top of your library THIS is the folder I would merge with so that the morph data for whatever figure you're adding is added. Then run the like named bat file for that figure.

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