Minor improvements to README and Setup guides

SETUP-PC.md

@@ -91,8 +91,10 @@ Then, create a new virtual environment with this command:
 `llms\Scripts\activate`
 You should see (llms) in your command prompt, which is your sign that things are going well.
 
-4. Run `pip install -r requirements.txt`  
+4. Run `python -m pip install --upgrade pip` followed by `pip install -r requirements.txt`  
 This may take a few minutes to install.
+In the very unlikely event that this doesn't go well, you should try the bullet-proof (but slower) version:  
+`pip install --retries 5 --timeout 15 --no-cache-dir --force-reinstall --verbose -r requirements.txt`
 
 5. **Start Jupyter Lab:**