To install download the file named  Addon_DPFR_DistributeObjects_#_##.py and save it to a convenient location.

Under Blender got to the Edit menu and open Preferences > Addons, then press the button on top that reads Install.

Browse to the downloaded file, double-click to install it, then enable it in the check box to the left. If you don't have Autosave Preferences enabled press the Save Preferences button on the bottom left if you want the addon to be available for future sessions by default as well.

To use the addon just select a bunch of objects in the 3D View, then go to the 3D View header menu under Object > Transform > Distribute.

Adjust settings as desired in the operator properties panel to the bottom left.

1. Start Point defines the place in the scene where objects will start to be arrayed.
   Options include the 3D Cursor (default), Active Object, or the Scene Origin (World 0,0,0).
2. Sort optional sorting for selected objects.
   Can be left unsorted (default) will use whatever selection order Blender internally defines (often object creation order), Sort by Name will make similarly named objects be placed in order, or by current X,Y or Z position in the scene, if you already had them in a visual order you desire
3. Spacing X, Y and Z adjusts the spacing between each object for each of the axis.
4. Count X and Y limits the number of objects in each direction, forcing to start populating a new row or column.
5. Max X and Y another type of limit defined by distance, after reaching defined distance a new row or column will be populated.

All methods have a reversed option.

The addon works by always distributing along X then Y then Z axis by this specific order. To stack objects exclusively on the Y or Z axis limit the count or distance of the previous axis to 1 or 0 respectively.

If you only want to distribute along the Y axis you can do so by limiting the count on the X axis to 1, so it wraps immediately and starts stacking along Y then Z instead.

If you want to stack on Z axis limit both X and Y to the count of 1.