This is the guide for upgrading in general. Sometimes there are exceptions to these guidelines, which are listed in the version-specific guide.
First of all, things may go wrong for various reasons. Make sure to ALWAYS make a backup of both your site's files and the database so that you can return to a version that you know works. You will need the backed up files for merging later so this step is not optional.
Before upgrading to a new major version (like v6 to v7), check if the packages you're using are compatible with the version you're upgrading to. On the package's download page, in the Project compatibility area, click View details to check version-specific compatibility.
It is necessary to run the upgrade installer on each environment of your Umbraco site. So if you want to update your staging and your live site then you need to repeat the steps below and make sure that you click through the install screens so that your upgrade is complete.
You can simply open up the Package Console and type:
Or you can open the NuGet Package Manager and select the Updates pane to get a list of available updates. Choose the package called UmbracoCms and click update. This will run through all the files and make sure you have the latest changes while leaving files you have updated.
If you're not upgrading to 7.2.0 or higher then you should follow these extra instructions, if you are upgrading to 7.2.0+ then you can skip this and go to Merge UI.xml and language files
The following only applies to upgrading to versions lower than 7.2.0
You will be asked to overwrite your web.config file and the files in /config, make sure to answer No to those questions.
For some inexplicable reason, the installation will fail if you click "No to All" (in the GUI) or answer "L" (in the package manager console) to the question: "File 'Web.config' already exists in project 'MySite'. Do you want to overwrite it?" So make sure to only answer "No" (in the GUI) or "N" (in the package manager console).
Now here comes the tricky bit: We'll be mean and overwrite your web.config file anyway. But we'll back it up so don't worry. (Plus you already had your own backup, right?) You can find the backup in App_Data\NuGetBackup\20140320-165450\. (The 20140320-165450 bit is the date and time when the backup occurred, which varies.) You can then merge your config files and make sure they're completely up to date.
Download the .zip file for the new version you are upgrading to from http://our.umbraco.org/download
Copy the following folders from inside the .zip file over the existing folders in your site:
Note: There are hosting providers (we know of one: RackSpace Cloud) that require proper casing of file and folder names. Normally on Windows this is not a problem but if your hosting provider forces proper casing then you will need to verify that the folder and file names are in the same casing as in the newest version you're upgrading to.
You can expect some changes to the following configuration files:
Use a tool like WinMerge to check changes between all of the config files. Depending on when you last did this there may have been updates to quite a few of them.
There's also the possibility that some files in the /Config folder are new or some have been removed (we do make a note of this in the release notes). WinMerge (and other diff tools) is able to compare folders as well so you can more easily spot these differences.
Up until version 6.0.0 it was necessary to change the version number in ClientDependency.config. This was to clear the cached html/css/js files in the backoffice. Just change the current version number to one that's higher than that. Make sure not to skip this step as you might get strange behaviour in the backoffice otherwise.
Some packages (like Contour) add dialogs to the UI.xml. Make sure to merge those changes back in from your backup during the upgrade so that the packages continue to work. This file can be found in: /Umbraco/Config/Create/UI.xml.
Packages like Contour and Courier also make changes to the language files located in: /Umbraco/Config/Lang/*.xml (typically en.xml).
After copying the files and making the config changes, you can open your site. You should see the installer which will guide you through the upgrade.
The installer will do two things:
We are aware that, currently, the installer is asking you for the database details of a blank database while upgrading. In the near future this will be prefilled with your existing details and the wording will be updated. So no need to be scared. Just enter the details of your existing database and Umbraco will upgrade it to the latest version when necessary.
One important recommendation is to always remove the install folder immediately after upgrading Umbraco and never to upload it to a live server.
One way to nudge the cache in Chrome is to open the developer tools (F12) and go to the settings (the cog icon). There will be a checkbox that says "Disable cache (while DevTools is open)". Once this checkbox is on you can refresh the page and the cache should be invalidated. To force it even more, the "reload" button next to your address bar now has extra options when you right-click it. It should have "Normal reload", "Hard reload" and "Empty cache and hard reload" now. The last option is the most thorough and you might want to try that.