Hi @Biuer, actually it depends on the Aseprite version that you are using. First of all you will need to locate your user configuration directory: Edit > Preferences > General > Locate Configuration File, this should open your personal configuration folder. Right there is a
- For Aseprite v1.1.13, the theme goes inside
- For Aseprite v1.2-beta9, the theme goes in
- For the future version of Aseprite (v1.2-beta10) this will be simplified, so I'll update this post when it's released.
The problem here is that you might be trying to use a theme for an incompatible version of Aseprite. For example, a beta theme (v1.2) doesn't work for the stable (v1.1.13) and viceversa.
In the specific case of michidk's DarkFlat, it looks like a theme for v1.1.13, so you might be running Aseprite v1.1.13, in this case. If you want to try the other themes you should switch to the beta version.