Update: Please see public KB License Manager APLclient download
Is there a download link for the License Manager?
Yes. see entitlements page. Last line on the Current Product list.
However, it is only a standalone version that allows modification to .lic, but does not create it
How do customers using the TK nuget package get licensing installed?
Or what if they do not have activepdf.lic or licenses.def files?
You can send them the zip file attached.
Extract the files to C:\ProgramData\activePDF\Licenses and run APLClient.exe to install your licenses.