We actually removed the 3 and 6 month options about a month ago. They weren't very popular (this is the first comment we've heard about it!) so we decided to simplify things a bit. Sorry for the inconvenience. Thanks for the heads up - we'll clarify the language at the bottom of the purchase page.
Why would you remove 3/6 months though? As far as I know it costs you no extra money or effort to have those options there.
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I was looking to add 3 months to dotabuff plus like I always do but there was only an option for single month and 1 year. Since when does that change? It states on that page at the bottom that you can choose 3/6/12 month but that isnt that case.