Hello, @JohnLandeborg1
I have a couple comments and suggestions that may help you solve this issue.
1) During installation, does the install wizard give you a warning that either Node.js is not found or that the installed version of Node.js is not supported?
2) ArcGIS Enterprise SDK version 11.2 supports a higher version of Node.js than 11.1. For instance, 11.2 requires a version of Node.js between 16.19.1 and 18.17.0. An appropriate for Node.js version for 11.1 would be 14.21.3 for instance.
3) Are you managing your Node.js versions on your machine with NVM for Windows? I am assuming you are using Windows here, but if you are using Linux, please let me know, and I can change our conversation toward Linux installations. In 11.2, Node.js installations performed with NVM for Windows are supported. In 11.1, I would suggest installing Node.js directly from the download https://nodejs.org/en/download.
So after all that, this is what I would suggest you try at this point:
1 - Uninstall ArcGIS Enterprise SDK
2 - Uninstall your current version of Node.js (regardless of the method you used to install it), and make sure there is no "nodejs" folder in "C:\Program Files"
3 - Use the link above to download and install Node.js 14.21.3
4 - Install ArcGIS Enterprise SDK version 11.1
If you have any questions or concerns before trying these steps, please don't hesitate to reply.