Sandbox vs. Production Issues
One of the most common problems. User clicks on the install link and it won’t install on their sandbox or it won’t install on their production org.
The key to getting past this is learning something simple and powerful: package install links for production orgs always start with ‘login’ and links for sandboxes always start with ‘test’. We often only publish a single install link. So if that install link is something like this:
It will not install onto Sandboxes as is. However, all you have to do is paste the link into your browser and then replace ‘login’ with ‘test’, like this:
You can also go the other direction.