I found a solution (How to integrate my stnyb.ckpt ?).
You have to edit the models.yaml file (SDImageGenerator-2.0.0-portable-x64\sdenv\stablediffusion\configs\models.yaml)
and added your model.
The easiest solution is to copy and paste from :
--------------------
your_model:
description: of your model
config: configs/stable-diffusion/v1-inference.yaml
weights: models/ldm/stable-diffusion-v1/your_model.ckpt
vae: models/ldm/stable-diffusion-v1/vae-ft-mse-840000-ema-pruned.ckpt
width: 512
height: 512
---------------------
replace 'your_model' with the name of your ckpt file.
Don't forget to copy your custom template into :
SDImageGenerator-2.0.0-portable-x64\sdenv\stablediffusion\models\ldm\stable-diffusion-v1
Now,
1- Open: 'SDImageGenerator.exe"
2- Click on the "Dream" button and wait (the load)
3- Go to "Models Switch" in the settings tab
4- In the drop down menu Models Switch, choose your model (it appears thanks to the little manipulation above)
5- Click on : 'Switch model'
6- Wait for the confirmation window to appear
That's it! You can use your custom model