This happens if the minecraft launcher can't get access to the minecraft servers. If you play the game from the website first, then you will get access to an offline version through the launcher
If you have access to an account that has bought Minecraft, which is hard to do for free, then you can play in-browser and download the launcher to play offline.
Go to where you downloaded the file and click on it and it should open the launcher and it will download the Minecraft game. It should only take about 15 minutes depending on how fast your internet connection is.
I'm 99% sure that you can't, you have to get the downloaded launcher. You can get it here https://minecraft.net/download
Um... did you try logging in? You still need to log in.
When you register for Minecraft, you have a free account. You can play the free Classic online version. You can still download the Minecraft launcher, you just won't be able to play it without paying for it first. Once your account is premium you can log into the launcher (that you downloaded) and it will download the rest of the game.
Updating minecraft on the computer is very easy. When you open the launcher and log in, it should download the new version automatically (if you confirm it). Obviously, this requires an internet connection. The only difference is updating to 1.6.1. This version requires you to visit the minecraft website, go to the downloads section, and download the new launcher. Then, when you want to play minecraft, you open the new launcher, login, download the update automatically, and play.
Buy the game, download the portable launcher, then run it once to download the game files. Once the game files are downloaded, you can play it offline. Anyway, you can't get Minecraft for free legally.
how to log in minecraft 1.3.9
You need to log in to an Premium Account the first time you install the launcher in order to play offline. However, sometimes the launcher fails to connect to Minecraft.net. Try a couple of times, if the problem persists check your internet connection, and also make sure Minecraft.net is not down for some reason.
delete both javas and unless you don't have windows 10, re-doanload windows 10again
Download the launcher at minecraft.net/download to play Minecraft.
Go to the Minecraft website and download the offline launcher, note that the offline option only appears if you are actually offline.