Add 6.26.20 release

Author: dpiparo

_releases/release-62620.md

@@ -0,0 +1,75 @@
+---
+layout: releases
+version: 6.26.20
+release_date: 2026-06-10
+state:
+
+toc: true
+toc_sticky: true
+sidebar:
+  nav: "releases"
+---
+
+## Release Notes
+
+**This is the final patch for the 6.26 release series, as per [ROOT's release and support plan](https://root.cern/install/all_releases/).**
+
+The release notes for this release can be found [here](https://root.cern/doc/v626/release-notes.html#release-6.26.20).
+
+## Binary distributions
+
+Instead of manually downloading this binary, please explore first whether your [package manager](../../install/#install-via-a-package-manager){:target="\_blank"} already provides this version.
+This way, you will automatically keep up-to-date with the latest stable versions with no manual maintenance on your side.
+
+| Platform       | Files | Size |
+|-----------|-------|-----|
+| root_v6.26.20.Linux-AlmaLinux8.10x86_64-gcc8.5.tar.gz | [root_v6.26.20.Linux-AlmaLinux8.10x86_64-gcc8.5.tar.gz](https://root.cern/download/root_v6.26.20.Linux-AlmaLinux8.10x86_64-gcc8.5.tar.gz) | 235M |
+| root_v6.26.20.Linux-AlmaLinux9.8x86_64-gcc11.5.tar.gz | [root_v6.26.20.Linux-AlmaLinux9.8x86_64-gcc11.5.tar.gz](https://root.cern/download/root_v6.26.20.Linux-AlmaLinux9.8x86_64-gcc11.5.tar.gz) | 250M |
+| Ubuntu 22 | [root_v6.26.20.Linux-ubuntu22-x86_64-gcc11.4.tar.gz](https://root.cern/download/root_v6.26.20.Linux-ubuntu22-x86_64-gcc11.4.tar.gz) | 250M |
+
+## Source distribution
+
+| Platform       | Files | Size |
+|-----------|-------|-----|
+| source | [root_v6.26.20.source.tar.gz](https://root.cern/download/root_v6.26.20.source.tar.gz) | 186M |
+
+
+## Installations in CVMFS
+
+Standalone installations with minimal external dependencies are available at:
+~~~
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.26.20/almalinux8.10x86_64-gcc85-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.26.20/almalinux9.8x86_64-gcc115-opt
+/cvmfs/sft.cern.ch/lcg/app/releases/ROOT/6.26.20/x86_64-ubuntu22-gcc114-opt
+~~~
+
+
+## Git
+
+The entire ROOT source can be obtained from our public Git repository:
+
+~~~
+git clone https://github.com/root-project/root.git
+~~~
+The release specific tag can be obtained using:
+~~~
+cd root
+git checkout -b v6-26-20 v6-26-20
+~~~
+
+See [instructions to build from source](../../install/#build-from-source){:target="\_blank"}.
+
+## Windows
+
+Windows 10/7/... are supported. We offer two packaging types:
+
+ * **exe**: a regular Windows installer package also setting up the required environment variables. With uninstall via "Control Panel" / "Add or Remove Programs". Simply download and start. You can double-click ROOT to run it; ROOT files get registered with Windows.
+ * **tar**: unpack e.g. with [7zip](https://www.7-zip.org). Start ROOT in a Microsoft Visual Studio Prompt (in Start / Programs / Microsoft Visual Studio / Tools). If you installed ROOT to `C:\root` then call `C:\root\bin\thisroot.bat` before using ROOT to set up required environment variables. Call instead `thisroot.ps1` if you run from a `powershell` (the default terminal in Visual Studio Code).
+
+### Important installation notes
+
+ * You must download the binary built with the exact same version of Visual Studio (and Python) than the one installed on your system.
+ * Don't forget to select the component “Desktop development with C++" when running the Visual Studio Installer.
+ * Do not untar in a directory with a name containing blank characters.
+ * Take the release version if performance matters.
+ * If you want to debug your code you need the ROOT debug build (you cannot mix release / debug builds due to a Microsoft restriction).