I am trying to download the trial for Drone2Map, but it keeps giving me an error, saying I need an Organizational account.
I have an account linked to our organization, but it's not an AGOL account, we strictly use Portal and Server in-house.
This has happened with other downloads that I have tried on ArcGIS as well.
Is there any way that I can download this without having to create a AGOL account?
I would think you would have an AGOL account, you just are not aware of it. How are you obtaining your licenses to license Portal and AGS? you would sign in... using an esri / AGOL account. your organization would be able to create your organization AGOL account when you purchase the Enterprise GIS software.
If you do not know of that account, contact your purchaser of the software, they would have it or ESRI customer support.
I believe it is in the works to be able to transfer the D2M license to your portal if not already. (you would need portal 10.5+)