S5 Previews for WowLights sequences can be downloaded at the links below:

Christmas:
S5 Christmas 32 Output (16-32 Layouts)
S5 Christmas 64 Output (48-64 Layouts)
S5 Christmas 128 Output (80-128 Layouts)
S5 Christmas 128RGB Output (64RGB & 128RGB Layouts)
S5 Christmas Pro & Pro Plus Layouts

Halloween:
S5 Halloween 32 Output (16-32 Layouts)
S5 Halloween 32RGB (32RGB Layout)
S5 Halloween Pro & Pro Plus Layouts

4th of July:
S4 4th of July Layouts (16, 32)
S5 4th of July Pro & Pro Plus Layouts

After Downloading and installing the preview open the Light-O-Rama Sequencer and in the previews section click the Import/Export button (picture of window with left arrow) and click Import Preview. Open the preview and click Save.

Then when opening a sequence select "Use an existing preview", use the drop down to select the preview, click OK, make sure "Select all tracks/grid views" is checked and click OK. Then click File > Save to save the sequence with the preview attached.