I Took This Off The Runescape Website, I Posted It Here To Help Some People out.

For Windows

Right click the Windows icon (usually in the bottom left corner) and select Open Windows Explorer.
Browse to C:\Users\{user}\jagexcache\jagexlauncher\
{user} is the name of the account that actually did the downloadable client install.
Copy the runescape folder, and call it oldschool
Go into the oldschool folder, and rename runescape.prm to oldschool.prm (NOTE: if you don't have file extensions set as visible, you will see "runescape" rather than "runescape.prm" as the file - you'll need to just rename it to "oldschool", as the file extension will then stay the same)
Right click the oldschool.prm file and either select 'edit' or 'open with'.
If you need to select open with chose any text editor like Notepad or Write.
When the file opens find the line that says -Dcom.jagex.config=http://www.runescape.com/k=3/l=$(Language:0)/jav_config.ws and change it to say -Dcom.jagex.config=http://oldschool.runescape.com/jav_config.ws
Language:0 may be :1 :2 etc. This is redundant for oldschool servers as they are English only.
Save the file.
Copy your shortcut to the downloadable client to a new one, called Old School RuneScape, or similar
Edit the new shortcut so that where it says "JagexLauncher.exe runescape" it now says "JagexLauncher.exe oldschool"
Open the downloadable client using the new link to get the old school game, or your old link to get the main game!

Reverting the changes

If you get something wrong, to return the client back to the default live game, simply follow this guide again, and replace the line -Dcom.jagex.config=http://oldschool.runescape.com/jav_config.ws with -Dcom.jagex.config=http://www.runescape.com/k=3/l=$(Language:0)/jav_config.ws.
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Mac OSx

In Finder click on Applications.
Right click on the RuneScape icon.
Select Show Package Contents.
Double click on the folder Contents.
Double click on the file Info.plist
In the Info.plist file look for the line <string>http://www.runescape.com/k=3/l=$(Language:0)/jav_config.ws</string> and change it to say <string>http://oldschool.runescape.com/jav_config.ws </string>
Language:0 may be :1 :2 etc. This is redundant for oldschool servers as they are English only.
Save the file.
Open the downloadable client as you normally would.

Reverting the changes

To return the client back to the default live game, simply follow this guide again, and replace the line <string>http://oldschool.runescape.com/jav_config.ws </string> with <string>http://www.runescape.com/k=3/l=$(Language:0)/jav_config.ws</string>.




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