Yes, detect markers is available in Pro only. But you can try to optimize the alignment even in Standard edition.
I've used that due to the workflow description on the model's page on Sketchfab:
Import
Align -> Detect Markers -> Align 2 times
Set reconstruction region around the subject.
Reconstruction : Normal
Close Holes -> Clean Model
Simplify -> Smooth
And I have removed any trimming radius related tweaks prior to the processing the mesh. Used pre-release of 1.6.0 though.
Yes, missing the detect markers feature doesn't seem to be that big of an issue here.
BTW I'm testing on Build 1.6.0 build 9217.
The fact that the algorithm still insists on creating unwanted polys when there isn't enough depth data is still the most annoying thing ever...I would literately be happy with a simple hole in the mesh (or how it was handled pre-1.5.1) instead of this mess which is a real pain to clean up afterwards in 3DCoat/Zbrush.
Cheers