It's available in the PluginStore https://sketchucation.com/pluginstore?pln=Latticeizer
Get its RBZ and install it, just like any other...
Alternatively use the SketchUcation ExtensionStore³ from within SketchUp itself, to Auto-Install it...

It works just fine in the newer SketchUps...

But note that it's not been signed for full compatibility with newer SketchUp, so your 'Extension Loading Policy' needs to be set to 'Unrestricted' for it to load and appear in the Extensions menu...

@robint

It's been 11 years since I wrote it.
As far as I know it works with all SketchUp versions currently available.
I've had no reports of issues with v2017.
However, I just tried it in v2017 and it was very slow and eventually SketchUp quit, with no error messages.

I'll look at it but I can't promise a fix, it is v-e-r-y old...

Without a lot more detail, or even a SKP, we are guessing - e.g. perhaps you are holding your tongue wrongly