tls-client is not installed in the running Python. The PyPI name is `tls-client` (dash), the import is `tls_client` (underscore). Run `python -m pip install tls-client` and the import works.

## The error

```text
ModuleNotFoundError: No module named 'tls_client'
```

## Fix it

1. **Install tls-client**

```
python -m pip install tls-client
```
Expected: `Successfully installed tls-client-...`.

2. **Confirm**

```
python -c "import tls_client; print('ok')"
```
Expected: prints `ok`. If this now fails on `typing_extensions`, install that too (next skill in this set).

## When this applies

- any tls_client import fails naming `tls_client`
- a fresh env for a TLS-fingerprinting scraper

## When it does NOT apply

- `No module named 'typing_extensions'` means tls_client IS there but its dependency is not
- `cannot import name 'fingerprints'` means the installed wheel is damaged

## Compatibility

tls-client 1.x/2.x. Ships prebuilt wheels; needs Python 3.8+.

## Why it happens

The package was never installed into the active interpreter, and the dash/underscore split between the PyPI name and the import name makes `pip install tls_client` (underscore) fail, so people sometimes conclude it is uninstallable.

## Edge cases

- `pip install tls_client` (underscore) does not exist on PyPI. The dash form is the only one.
- tls-client is a thin wrapper over a Go-compiled shared library. If the import fails with a dlopen error instead of ModuleNotFoundError, your platform lacks a wheel.