This could be a sign that your computer needs more VRAM. You can either upgrade or try the workaround below to limit the size of textures. If you plan on upgrading please check out our article regarding the recommended graphics card for our kits.
Limit the size of viewport textures in the preferences (GL Texture Limit)
STEP 1: Go to Blender Preferences.
To open the Blender Preferences window click Edit → Preferences... (Note: In Blender 2.79, you will find it under File → User Preferences...)
STEP 2: Click the Viewport tab.
STEP 3: Under textures select your desired limit size. The limit options are specified in a square of pixels (e.g.: the option 256 means a texture of 256×256 pixels).
Changing this setting will automatically limit the texture size, reducing the VRAM requirement for our kits.
You can now load kits on a less-powerful system!😊