Guys, whoever struggles to play through JoiPlay, here is small instructions for all of you (at least it worked for me):
- enter JoiPlay's patreon (for free, no need to subscribe)
- download latest public release of JoiPlay
- install it
- download Ren'Py Plugin 7.4.11
- install downloaded plugin
I hope it helps everyone, who reads it. AND DOWNLOAD EXACTLY 7.4.11, NOT ANY OTHER PLEASE.