```python
import os
import tempfile
from pyaedt import Hfss3dLayout
from pyaedt.generic.filesystem import Scratch

# 1. Creates a temporary folder and prints its path
temp_folder = tempfile.mkdtemp()
print(temp_folder)

# 2. Downloads an example file into the temporary folder
# Assuming example_file_url is the URL to the example file
example_file_url = "http://example.com/example.aedt"
example_file_path = os.path.join(temp_folder, "example.aedt")
Scratch.download_file(example_file_url, example_file_path)

# 3. Sets the non-graphical mode and launches AEDT in graphical mode using SI units
aedt_non_graphical = False
aedt_version = "2023.1"  # Specify your AEDT version here

# 4. Initializes AEDT and launches HFSS 3D Layout
hfss = Hfss3dLayout(specified_version=aedt_version, non_graphical=aedt_non_graphical, new_desktop_session=True, designname="HFSSDesign1", solution_type="HFSS 3D Layout Design")

# 5. If the AEDT file already exists, it removes it and saves the project in the temporary folder
if os.path.exists(example_file_path):
    os.remove(example_file_path)
hfss.save_project(os.path.join(temp_folder, "HFSSDesign1.aedt"))

# 6. Prints the boundaries from the setups object
print(hfss.design_properties)

# 7. Hides all nets and then makes only two specified nets visible
specified_nets = ["Net1", "Net2"]
hfss.modeler.nets.set_visibility(False)  # Hides all nets
for net in specified_nets:
    hfss.modeler.nets[net].visible = True

# 8. Plots the two specified nets
for net in specified_nets:
    hfss.plot(show=False, plot_air_objects=False, nets=[net])

# 9. Makes all layers visible
hfss.modeler.layers.set_visibility(True)

# 10. Changes the color of a specified layer
specified_layer = "TopLayer"
hfss.modeler.layers[specified_layer].color = (255, 0, 0)  # Red

# 11. Disables the visibility of components for the top and bottom layers
hfss.modeler.layers["Top"].components_visible = False
hfss.modeler.layers["Bottom"].components_visible = False

# 12. Fits all so that all can be visualized
hfss.modeler.fit_all()

# 13. Closes the project and releases the desktop
hfss.close_project(saveproject=False)
hfss.release_desktop()
```