Minecraft dungeons is no longer in my luncher...

Good evening! So I have a big problem... I'm 1000% sure I bought Minecraft Dungeons in pre-order with the next DLC when the game was released I could play I had a lot of fun I had a little character named Listarax... BUT recently I had some problems with my computer so I had to buy a new one and I hadn't installed the Minecraft Dungeons Luncher yet it's only been a while since I've been reckoning that when I wanted to install Minecraft Dungeons I no longer have the play button... he asks me to buy it ... So I went to see everywhere is it is untraceable ... I don't know what to do more I don't even know if I bought it with paypal or if it was offered to me ... one thing that is sure is that I could launch my luncher minecraft is since recently I can't because he asks me to buy it ... I don't know what to do I looked in my e-mail but I do a sort every month so I probably deleted the proof that I had the game ... Could you help me to know where it went please I'd like to play again but it's not there :c