No Longer Actively Fixing Bugs
But if you create a PR I'll be happy to merge them in.
Create ISO Camera addon for Blender 2.8+
Initial creator, 2.8 update and bitbucket thread can be found Blender Artist
To Find it Blender 2.82+
Try to Shift+tab+a and there is a option to "Create Isocam" - As reported in this issue