It’s single file addon, so you don’t need install it from zip. From zip files blender searches init file as start point. And I don’t have one. If you download the zip file from GitHub, it is a source code, and the addon is next called “slap_it.py”.
I usually use the built-in bake from Grungit. If that’s not enough, I’ll use BakeLab 2 but ultimately you will always find a solution with Bake Wrangler (never used). I only use EasyBake for the hi to low Poly story.
location: <unknown location>:-1
Error: Python: Traceback (most recent call last):
File "E:\Blender\scripts\addons\slap_it.py", line 98, in execute bpy.ops.mesh.knife_project(override);
File "E:\Blender\3.0\scripts\modules\bpy\ops.py", line 130, in __call__ ret = _op_call(self.idname_py(), C_dict, kw, C_exec, C_undo)
RuntimeError: Error: No other selected objects have wire or boundary edges to use for projection