 Here is a Python script that performs the SIwave DCIR analysis in HFSS 3D Layout using the pyaedt library as per your instructions. Please note that you need to have the pyaedt library installed and the necessary credentials for downloading files from the AWR website.

```python
from pyaedt import *

# Configure EDB for DCIR analysis
temp_dir = os.path.join(os.getcwd(), 'temp')
os.makedirs(temp_dir, exist_ok=True)

# Download example board into EDB
check_and_download_file('https://www.awrcad.com/files/example_board.edb', temp_dir)
edb_path = os.path.join(temp_dir, 'example_board.edb')

# Create a new project
project = open_project(edb_path)

# Create pin groups on VRM positive and negative pins
vrm_pos_pins = project.get_pins_by_name('VRM_POS')
vrm_neg_pins = project.get_pins_by_name('VRM_NEG')
vrm_pos_group = project.pin_groups.add('VRM_POS')
vrm_neg_group = project.pin_groups.add('VRM_NEG')
vrm_pos_group.add_pins(vrm_pos_pins)
vrm_neg_group.add_pins(vrm_neg_pins)

# Create a voltage source between these pin groups
vsource = project.create_voltage_source_on_pin(0, vrm_pos_group[0], 1.2)

# Create pin groups on sink component positive and negative pins
sink_pos_pins = project.get_pins_by_name('SINK_POS')
sink_neg_pins = project.get_pins_by_name('SINK_NEG')
sink_pos_group = project.pin_groups.add('SINK_POS')
sink_neg_group = project.pin_groups.add('SINK_NEG')
sink_pos_group.add_pins(sink_pos_pins)
sink_neg_group.add_pins(sink_neg_pins)

# Place a current source between these pin groups
icsource = project.create_current_source_on_pin(0, sink_pos_group[0], 10e-3)

# Add a SIwave DCIR analysis
dcir_analysis = project.add_analysis('SIwave DCIR')
dcir_analysis.set_frequency_range(1, 18, 'GHz')
dcir_analysis.set_max_iterations(100)
dcir_analysis.set_max_time(10)

# Save and close EDB
project.save()
project.close()

# Launch AEDT, import the configured EDB and analyze DCIR
aedt = launch_aedt()
aedt.open_and_load_a_polyline(edb_path)
aedt.run_analysis('SIwave DCIR')

# Retrieve and print the loop resistance, current source, and via information from the DCIR element data
dcir_element_data = aedt.get_dcir_element_data()
loop_resistance = dcir_element_data['Loop Resistance'][0]
current_source = dcir_element_data['Current Source'][0]
via_info = dcir_element_data['Via Information']
print(f'Loop Resistance: {loop_resistance} Ohms')
print(f'Current Source: {current_source} A')
print(f'Via Information: {via_info}')

# Retrieve and print the voltage from the DCIR solution data
dcir_solution_data = aedt.get_dcir_solution_data()
voltage = dcir_solution_data['Voltage'][0]
print(f'Voltage: {voltage} V')

# Close the AEDT project and release the desktop
aedt.close_project()
aedt.release_desktop()

# Clean cache and files
clean_cache_and_files(temp_dir)
```

This script assumes that the example board has pins named 'VRM_POS', 'VRM_NEG', 'SINK_POS', and 'SINK_NEG'. You may need to adjust the script according to your specific board design.