A. If you didn't install Illusion Plugin Architecture v1.4 before,
1. Extract and put all files inside Illusion Plugin Architecture SB into your main directory.
You will be asked to replace some .dlls. After that you will see some _Patched.exes added in main directory like the below picture.
Spoiler Show
2. Run SexyBeachPR_32_Patched or SexyBeachPR_64_Patched once to activate IPA in your main game.
3. Run SexyBeachStudio_32_Patched or SexyBeachStudio_64_Patched once to activate IPA in studio.
4. Put all files inside GGmodforSBPR into your main directory.
5. Open the game and you will see four pair of shoes named with "GGmod". If you choose the shoes and the body is changed to high heel model, then you have successfully installed the mod. Hurray
B. If you have installed Illusion Plugin Architecture v1.4 before,
Skip step 1, do steps 2-5.
C. Not sure whether you have installed Illusion Plugin Architecture v1.4 or not?
If you have SexyBeachPRPlugins folder then probably you have installed IPA without even noticing it.
An example would be installing a translation mod, or the HF patch that contains it. Skip step 1, do steps 2-5.
D. Every time when you installed an official patch,
Do steps 2-3 again to re-activate IPA.