That error means the Python environment running ezRA cannot find the rtlsdr module. The package you need is called pyrtlsdr, even though Python imports it as rtlsdr.
On your Windows ezRA computer, open Command Prompt and try:
python -m pip install “pyrtlsdr[lib]”
The [lib] version is a good choice on Windows because it also installs the librtlsdr binaries needed to communicate with the RTL-SDR.
Then test it:
python -c “from rtlsdr import RtlSdr; print(‘RTL-SDR module OK’)”
If you get:
RTL-SDR module OK
then try ezRA again.
If it still says No module named ‘rtlsdr’
The most likely explanation is that ezRA is running under a different Python installation from the one where pyrtlsdr was installed.
Run:
where python
python –version
python -m pip show pyrtlsdr
You may need to add the installation directory to the path variable.