If you check 'Hidden file' on the right side, the hidden 'AppDate' folder will be displayed. Open Drive C > User >, and click the 'View' tab on the menu bar.

Open the '.minecraft' folder (if you created the folder yourself as a 'game directory', go to 2-4).

Go to OptiFine download site, and download the latest 1.7.10 version (OptiFine 1.7.10 HD U E7) at the bottom of the page.

Next, install OptiFine as a Forge Mod, so that OptiFine can work together with Forge.

' is displayed in the lower left, Forge installation is complete. After a while, the title screen will be displayed, and if 'Minecraft Forge.

Click 'Play' to launch Minecraft again.

You can also select 'Resolution' (play screen size) as you like.

Change the 'NAME' of installation from '1.7.10 vanilla' to '1.7.10 Forge' (you can use any name).

Then, the edit screen will appear, so select 'release 1.7.10 Forge ' from 'VERSION'. Open the 'Installations' tab and click the '1.7.10 vanilla' created earlier. ', the Forge installation was successful! Click 'OK' to close. If the dialog box says 'Successfully installed. The installe folder can be left in the 'C: ~. Select 'Install client' (selected from the beginning).

Double-click the downloaded exe file or jar file to open the installer window.

Select 'Recommended' 'Windows Installer' or 'Installer' on the right.

Go to Minecraft Forge download site and download the installer for 1.7.10 (this link is already for the 1.7.10 page).Then, Minecraft 1.7.10 in the default state (vanilla) will start. Or go back to the 'Play' tab, select '1.7.10 Vanilla' you just created from the selection box at the bottom of the window, and click 'Play' (Both are the same result). Click 'Play' at the right end of the '1.7.10 vanilla'.Browse and select the folder and click 'Create'. At this time, if you want to create a 'GAME DIRECTORY' dedicated to 1.7.10 (folder where are stored save data, mods, resource packs, etc.), create an empty folder on the desktop, etc. Enter any name (for example, “1.7.10 vanilla”) in the 'NAME' box and select 'release 1.7.10' in the 'VERSION' box.( If you have already started 1.7.10, you can skip this step, go to 1-4.) On the next screen, select '+ New' just below. Open Minecraft (Launcher) and click 'Installations' tab in the menu at the top of the 'Minecraft: Java Edition' tab.

First, create a launch configuration for 1.7.10 and launch it.

Minecraft forge 1.7.1