That your friends laptop gets restarted by Windows Update is completely irrelevant to Blizzard. Do not bypass the language filter. Access to the Classic realms is a free bonus to your paid time at retail BfA WoW.
Character Transfer Classic
They’ve already addressed this before the start of the Classic Launch:https://eu.forums.blizzard.com/en/wow/t/overcrowded-realm-update/70777/1
Realm Queues & Maximum capacity increased:
With a hotfix to WoW Classic a few moments ago, we’ve changed how the realm population labels work in order to display realm populations in a more meaningful way.
How it worked before this hotfix
As we explained here , the system previously calculated the population labels by comparing all realms to the most-populated realm. This could result in a very crowded realm (with a lengthy queue) showing up as “Medium”, since it was being compared to the realm that had the highest population and a pote…
With hotfixes that we are currently deploying to all WoW Classic realms, we are substantially increasing the number of players that can be simultaneously logged in and playing. We expect this to result in smaller queues for realms that have large queues, and some realms should no longer have queues at all.
We will closely monitor performance and stability throughout this process.
Thank you very much.