When I open the file I get the following message "An error occurred, please reinstall the application" try to download the program again and the download page no longer allows me to download it.
Viewing post in 3DPixel Anim, finish your game! comments
There is no installation, it is a portable app. Did you delete any files in the app folder? If you still have the zip file just unzip it and you should be good to go. Make sure to set up your model texture in Blender like in the video.
If this is an issue with your 3D model you can click reset on the menu, that will restore the original models.