First, read this tutorial:
https://www.facebook.com/groups/pentaxfotopublic/posts/3651475341686597/
In short, download the script files here for your camera model, namely, for K-1, K-1 II and K-3 III respectively:
https://mega.nz/folder/wWxWlJYb#reCBbvWHzcjRrnMzfpda3A
Follow the below steps:
1. Copy the unzipped files to the root directory of SD card and put the card in Slot 1 of the camera, with the original folder structure;
2. Turn off the camera and while pressing the "Menu" button, turning on the camera;
3. After seeing "Script - Enable", the camera can be turned off;
4. The four seasonal filters now become available after the camera is turned on again.
Btw, I have tried the above method for my K-3 III and the original K-1, both with the latest firmwares. It is found that only the K-3 III have had the filters successfully unleashed but I couldn't see the "Script - Enable" message with my K-1.
[Update] For K-1/II, the SD card slot needed to keep opened while pressing the Menu button and turning on the camera at the same time. The four new seasonal Custom Images will appear thereafter.
