Hello! You can find the AfterEffects script on this repository: spine-scripts/aftereffects at master · EsotericSoftware/spine-scripts

Erika spine of this plug-in I found that I can not download, this may be I am not familiar with the new version of the master, plug-in download, I download his browser will jump to the code page.

ACG 89

If it goes to the code page, it's because you left clicked the link.
Right click the file you want to download and the click Save As or Save Link As depending on your browser and OS.