gustavoChico Try this launcher, you can run any version you want.
https://www.construct.net/en/forum/construct-3/general-discussion-7/construct-desktop-launcher-139502
I tried both launchers before posting any of this, same result.
A workaround Andre gave me was "I flipped through custom again, chose beta and launched and now it did launch me into the correct version. The "do you want to update to latest version" prompt came up but I chose "not now" and it didn't update."
That works, but I'm not a fan of third party stuff, and I think this is a legitimate issue. I'd like to know the reasoning behind forcing an update on a random date, that's all. Another user reported this isn't the first time this has happened. I woke up this morning to find my plugin list empty, and an update I legitimately didn't want and scared the crap out of me.
I hope I'm not sounding too harsh here, Construct 3 is absolutely amazing, and this is the first time I've ever come across something to complain about. The devs do an absolutely incredible work.