I recently switched computers, and I don't know how to log in on my new computer (or on the minecraft website).
I always log in via my username, which I've been using for years. I can't remember the e-mail adress I used to register.
On my old pc I can just run the launcher, and I'm automatically logged in to my account. No need to use an e-mail adress or password.
I don't have a transaction ID either, since I bought the game years ago.
Is there any way to log in to my account knowing just my username and password?
Contact Mojang, ONLY they can help with account issues like yours