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Gotta do it with Ymir, Jane, Mikasa and Sasha first. Then MC will start saying (when he wakes up) that it's Christa, Elsa and Mikasa left. Focus on Christa. 
Try getting her in the hallway > Ymir stops you. Talk to Ymir, get them booze. Then talk to Christa again and get a new scene. Focus on Elsa next

Because we're planning to add options to update the game online, when you're inside the game 

don't download builds from strange websites

Takes about 1.5 month to release alpha, public releases every 2 months

28.1 is yet for 20$ 
it'll be available to 10$ a bit later today

Go to the eatery at noon, there'll be a bottle of milk standing on the table. Click on it

You gotta progess other girls' quests and it'll start automatically

You can buy the latest build by following the link in the description, friend

There's no message saying you're finished, quests are over = you're done for now

Does it say anything when launching? What happens exactly?

When booting a game, choose all, not none

Wdym you can't unlock anything? There're five scenes to unlock, more will be added in a few days, it's called alpha for a reason. 

Try sleeping in your bed and make sure you're playing arc 3

Wdym, there's only 28. here

Because they were breaking patreon TOS

These two are unrelated, mate

Try sleeping, mate 

You gotta download the newest one

It won't. 0.28 will be available later for web.

Always does

Thank you, mate

Yeah, there'll be some new scenes

Not really, no. 

Progress other girls, Christa will take you there first, man

You can't, it's WIP

Simply keep progressing other girls

Hopefully

Different choice on how you do her, mate

Hopefully, working on it

Those are gone

Because that save was made more than a year ago on some old version of the game

Progress the story, you can't get out right from the start

Yeah, working on it

Click on her bed, pillow at noon

Part 3 has been out for quite some time now.

Then you downloaded not the android version. On android it's apk file, you run it and just install the game.

It'll get updated once the next paid update drops 

Not sure what version of the game you're talking about

Keep coming to showers at sunset, there's a chance she'll be there

No, it means you've done all the events