If you have downloaded a font from the Internet, chances are it is Packed in the archive, so it should start with retrieving the file. You can click on the archive, right-click and choose in the pop menu one of the options for this operation: "extract to current folder", "Extract files" etc - in different archivers use different wording for these commands. In this case, would retrieve all objects including unnecessary to install the accompanying texts, pictures, samples, labels with links, etc. This can be avoided if double-click to open a window with a contents list and select a file it will have the extension ttf or otf. This object can then be dragged from the list box, for example, to your desktop.Prepared file need to install the operating system, as Photoshop uses the system fonts. If the computer is running Windows 7 or Vista, the easiest way to do this via the file's context menu - click right-click and select the command "Install". But you can do it "manually" by moving the file to the Fonts folder, which is placed in a directory with the operating system - usually called Windows. After this we need to get a graphics editor to update its information about the contents of a folder with fonts. If your last operation was not in Photoshop using the Text tool, it is enough to activate it. Otherwise, you may need to restart the application.In addition to the system fonts all installed in the computer Adobe can use your own list of fonts. It is formed from files placed in a directory with the name Fonts, but located on the system disk in Program Files/Common Files/Adobe/Fonts (Mac - Library/Application Support/Adobe/Fonts). If you want to limit the use of installed font only Adobe applications, copy the file in this folder.