At real wow cheat engine dont work. On private server you dont need to make it undetective. (Butt if it does: you can make it undetective by ourself with the following guide)
It should be automatic. If it's not for you I recommend blizzard's help page
The only way to do this is to reinstall the game from disk (patch 1.1) and manually run each and every patch up to patch 1.21 and keep it that way. Note that if you do this, you will not be able to access the Blizzard game servers until you have patched up to the current patch level. This will only allow you to access very outdated classic private servers. It is not possible to downgrade a fully patched installation of WoW down to 1.21 again. You can only grade up, not down.
Selling World of Warcraft accounts is against the Terms of Service that you agree to every time you install/reinstall/patch WoW. If Blizzard catches you, the account will be banned, all gold/gear will be deleted. I dont know if they call the cops or not, since internet crime is a grey area for most people.
dont buy any more cards.
Yes, after the overnight patch and restart.
just delete that patch in your wow client folder
A patch mirror in WoW is a common element for that whenever a new patch is released for the game, it can be downloaded from different sources. One popular place for the patch is DepositFiles.
The only way on your own to downgrade is to have copies of each patch level of Wow - that is after each patch save the game folders to a backup location. If you have a friend who hasn't patched yet, a copy of their game folder will work (just remove preferences.)
Cataclysm Patch.
Start your WoW game like normal and Blizzard downloader should automatically start downloading the Latest patch.
You can just delete the patch file once downloaded and installed by wow. You can not revert wow to a previous version because wow is auto-updating. Every client has the exact same version (for their OS).
Use the wow-launcher? It auto-patches the game and it starts automatically.
The latest WoW patch, 5.2.0, and is known as the Thunder King Patch. The patch brings a massive new zone, a new raid, server-wide events, new factions and new world bosses.
Official wow patches are applied automatically, there is no way you can NOT download the patch. If there is a patch available, the client will update itself. If you choose not to update, you will not be able to play.
Sometimes when you click on WoW, and log into your account it says new patch, and it loads to 100% then turns off WoW and opens a mini tab that shows the patch being downloaded.
Download the patch from a mirror. Double click the patch you just downloaded, should install itself.