Steps to reproduce:

1. Open a new Unity project
2. Make sure your device is offline (e.g. disconnect from the Wi-Fi)
3. Open the Package Manager via Window > Package Manager
4. Select the 'Unity Registry' tab so the registry packages display in the list panel
5. Find and select the Collections package
6. On the package view, click on the Version History tab
7. Click on Update next to 2.4.2
8. If an Updating package pop-up appears, press 'Yes'

Actual results: The package manager starts the update then throws an error. This error does not mention the lack of an internet connection and tells the user to check their firewall: 

!image-2024-08-13-16-27-42-217.png|width=502,height=77!

Expected results: 

One of two results are expected:

Either the 'Update' button is greyed out and unclickable (this matches up to the functionality in the My Assets tab, where the 'Download' button is greyed out if the user loses their internet connection.

!image-2024-08-13-16-27-59-814.png!

Or the Package Manager informs the user that they appear to be offline when they press the 'Update' button and doesn't try to go through with the update.

Reproducible with versions: 

• 6000.0.15f1
• 2022.3.41f1
• 2021.3.40f1

Not reproducible with versions: - 

Can’t test with versions: - 

Tested on (OS): Windows 10/11

Notes: 

• Collections is a package with a Version History update in Unity 6. If trying to reproduce on 2022 or 2021, find another package that has an available update. 
• If the Collections package updates even when you are offline, this means it is already in your local cache. Close your project, delete your Unity Package cache, then restart the repro steps.