Hi @Benni77
I used GUI GUIDER 1.8.0 before and now I use 1.9.1.
The project you created in GUI GUIDER 1.8.0 is LVGL V8 version.
GUI GUIDER support both LVGL v8 and v9 version.
You can open it with the GUI GUIDER 1.9.1.
But you can not Convert V8 Project to Latest LVGL Version.
BR
Harry