Update README.md

Add help on how to re-download model.

Author: chrismarra

README.md

@@ -8,6 +8,10 @@ This repository is intended as a minimal example to load [Llama 2](https://ai.me
 
 ## Download
 
+⚠️ **7/18: We're aware of people encountering a number of download issues today. Anyone still encountering issues should remove all local files, re-clone the repository, and [request a new download link](https://ai.meta.com/resources/models-and-libraries/llama-downloads/). It's critical to do all of these in case you have local corrupt files. When you receive the email, copy *only* the link text - it should begin with https://download.llamameta.net and not with https://l.facebook.com, which will give errors.**
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 In order to download the model weights and tokenizer, please visit the [Meta AI website](https://ai.meta.com/resources/models-and-libraries/llama-downloads/) and accept our License.
 
 Once your request is approved, you will receive a signed URL over email. Then run the download.sh script, passing the URL provided when prompted to start the download. Make sure that you copy the URL text itself, **do not use the 'Copy link address' option** when you right click the URL. If the copied URL text starts with: https://download.llamameta.net, you copied it correctly. If the copied URL text starts with: https://l.facebook.com, you copied it the wrong way.