Plus42 Equations, Preview Release

[ggauny@live.fr]

Hello,

It's impossible here and for me to install plus42 1.0 apk. I've download it on my Samsung A41 but when I want to install a window appears and say : want you update this application ? in blue letters it is write undo and install.
But when I press : install, a window say : Plus 42, application non installed.

I have already on my android phone Free42 and plus42, but impossible for Plus beta test. You know why ? May be if you explain me well I shall enjoy of new features.

I enjoy very well on my Asus PC window 10.

Thanks.