Board manager does not have an option for megaAVR

[purvi_m]

Hi,
I am using Arduino IDE 1.8.19 with my Arduino UNO WiFi Rev 2. The board manager cannot detect megaAVR core and I'm not able to upload my sketches.

Error message:
Error downloading https://downloads.arduino.cc/packages/package_index.json

[ptillisch]

Hi @purvi_m. I'm going to ask you to post some additional information that might help us to identify the problem.

Please do this:

1. Close all Arduino IDE windows.
2. Start Arduino IDE.
   (this restart was done to start from a blank console panel)
3. Select Tools > Board > Boards Manager from the Arduino IDE menus.
4. After the process fails, click the Close button.
5. Click on the black console panel at the bottom of the Arduino IDE window.
6. Press Ctrl+A to select all the text.
7. Press Ctrl+C.
   This will copy the selected text to the clipboard.
8. Open a forum reply here by clicking the Reply button.
9. Click the <CODE/> icon on the post composer toolbar. This will add the forum's code block markup (```) to your reply to make sure the error messages are correctly formatted.
   
10. Press Ctrl+V.
    This will paste the copied text into the code block.
11. Move the cursor outside of the code block markup before you add any additional text to your reply.
12. Click the Reply button to post the output.

[purvi_m]

Error downloading https://downloads.arduino.cc/packages/package_index.json

[ptillisch]

Hmm. I was hoping there might be some more information that would give a clue about the cause of the problem.

Is your computer connected to the Internet?

Is there any special configuration of your network (e.g., firewall, proxy, VPN) that might prevent Arduino IDE from downloading the file from that URL?

[purvi_m]

It is my office laptop, I have VPN connected.

[oqibidipo]

Can you open the URL in the browser?

[purvi_m]

Yes. This is what I get.