Pamac removed all my apps

When i tried to install Poweriso from AUR pamac removed all apps including kde ones, what do i do?

Installing a package, like poweriso should not be able to remove packages, unless they conflict.

Please post the contents of your /var/log/pacman.log inside ``` brackets.

How can i do that from the terminal? I can’t even log in cause the session is gone also pacman commands don’t work

Boot a live session from USB. Mount your Root partition and find it in there.
Doable, unless you encrupt your root partition.

How can i mount the root partition? Sorry for the noob questions

I haven’t had the need in a while, but once you booted the Live session from a USB, you should be able to see your partitions in the file manager. Clicking on it, should mount it, so you can browse it.

Kate crashes when i try to open the log file, the file is 10gb big and i can`t upload due to my slow connection (2mb bandwidth)

What log are you looking at? My pacman.log goes back 1 year, 8 months, 7 days and is only 5.2MB.

That is the file that i`m looking at, pacman.log, it is 10gb big and kate crashes if i try to open it

From a terminal, post output of:

head -n 20 /var/log/pacman.log

And

tail -n 20 /var/log/pacman.log

head -n 20 /var/log/pacman.log
[2021-03-09T14:37:10+0000] [PACMAN] Running ‘pacman --noconfirm --cachedir /var/cache/pacman/pkg --config /opt/mhwd/pacman-mhwd.conf --root / --needed -Sy xf86-video-ati xf86-video-amdgpu xf86-video-intel xf86-video-nouveau vulkan-intel vulkan-radeon libva-mesa-driver libva-vdpau-driver mesa-vdpau lib32-vulkan-intel lib32-vulkan-radeon lib32-libva-vdpau-driver lib32-mesa-vdpau’
[2021-03-09T14:37:10+0000] [PACMAN] synchronizing package lists
[2021-03-09T14:37:11+0000] [ALPM] transaction started
[2021-03-09T14:37:11+0000] [ALPM] installed xf86-video-ati (1:19.1.0-2)
[2021-03-09T14:37:11+0000] [ALPM] installed xf86-video-amdgpu (19.1.0-2)
[2021-03-09T14:37:11+0000] [ALPM] installed libxvmc (1.0.12-3)
[2021-03-09T14:37:11+0000] [ALPM] installed xf86-video-intel (1:2.99.917+908+g7181c5a4-1)
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] >>> This driver now uses DRI3 as the default Direct Rendering
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] Infrastructure. You can try falling back to DRI2 if you run
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] into trouble. To do so, save a file with the following
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] content as /etc/X11/xorg.conf.d/20-intel.conf :
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] Section “Device”
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] Identifier “Intel Graphics”
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] Driver “intel”
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] Option “DRI” “2” # DRI3 is now default
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] #Option “AccelMethod” “sna” # default
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] #Option “AccelMethod” “uxa” # fallback
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] EndSection
[2021-03-09T14:37:11+0000] [ALPM] installed xf86-video-nouveau (1.0.16-2)
[2021-03-09T14:37:11+0000] [ALPM] installed vulkan-intel (20.0.7-3)

10GB in one day???

Something is seriously wrong, here.

tail -n 20 /var/log/pacman.log
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET] >>> This driver now uses DRI3 as the default Direct Rendering
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET]     Infrastructure. You can try falling back to DRI2 if you run
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET]     into trouble. To do so, save a file with the following 
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET]     content as /etc/X11/xorg.conf.d/20-intel.conf :
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET]       Section "Device"
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET]         Identifier  "Intel Graphics"
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET]         Driver      "intel"
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET]         Option      "DRI" "2"             # DRI3 is now default 
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET]         #Option      "AccelMethod"  "sna" # default
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET]         #Option      "AccelMethod"  "uxa" # fallback
[2021-03-09T14:37:11+0000] [ALPM-SCRIPTLET]       EndSection
[2021-03-09T14:37:11+0000] [ALPM] installed xf86-video-nouveau (1.0.16-2)
[2021-03-09T14:37:11+0000] [ALPM] installed vulkan-intel (20.0.7-3)
[2021-03-09T14:37:11+0000] [ALPM] installed vulkan-radeon (20.0.7-3)
[2021-03-09T14:37:11+0000] [ALPM] installed mesa-vdpau (20.0.7-3)
[2021-03-09T14:37:11+0000] [ALPM] installed lib32-vulkan-intel (20.0.7-3)
[2021-03-09T14:37:11+0000] [ALPM] installed lib32-vulkan-radeon (20.0.7-3)
[2021-03-09T14:37:11+0000] [ALPM] installed lib32-mesa-vdpau (20.0.7-3)
[2021-03-09T14:37:19+0000] [ALPM] transaction completed
[2021-03-09T14:37:19+0000] [ALPM] running '30-systemd-update.hook'...

4 months not one day, the log i`m trying to open is from my hdd, not from my live usb

According to pacman, this is your installation date:

2021-03-09 is not 4 months.

I installed Manjaro in september, not today something is wrong

Normally, I don’t say/recommend this (try to fix it first), but:

Backup your personal data and start over. Your pacman.log looks like it’s borked beyond repair.

I think im gonna start from scratch, im just gonna backup my games and a few other stuff first