Install all dependencies (I am on Fedora, so for you this line might be different)

sudo dnf install \
  git \
  ninja-build \
  meson \
  gtk4-devel \
  libadwaita-devel \
  json-glib-devel \
  libsoup3-devel \
  libarchive-devel \
  desktop-file-utils \
  libgee-devel

Clone the GitHub repo and change to repo directory

git clone https://github.com/Vysp3r/ProtonPlus.git && \
  cd ProtonPlus

Build the local source code as a native application

./scripts/build-native.sh

# Alternative: Runs application after the build.
./scripts/build-native.sh run

(Optional) Install the application

cd build-native
ninja install

Run the application

cd src && \
./com.vysp3r.ProtonPlus

Install all dependencies (I am on Fedora, so for you this line might be different)

sudo dnf install \
  git \
  flatpak

Add the flathub repo to your system if not added before

flatpak --if-not-exists remote-add \
  flathub https://flathub.org/repo/flathub.flatpakrepo

Install the necessary runtimes and build tools for Flatpak

flatpak install \
  runtime/org.gnome.Sdk/x86_64/46 \
  runtime/org.gnome.Platform/x86_64/46 \
  runtime/org.freedesktop.Sdk.Extension.vala/x86_64/23.08 \
  org.flatpak.Builder

Clone the GitHub repo and change to repo directory

git clone https://github.com/Vysp3r/ProtonPlus.git && \
  cd ProtonPlus

Build the local source code as a Flatpak and install for the current user

./scripts/build-local.sh

# Alternative: Runs application after the build.
./scripts/build-local.sh run

Run the application

flatpak --user run \
  com.vysp3r.ProtonPlus