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Installation:
I used the old installation path first: C:Program FilesSteamSteamAppsaccounthalf-life but it doesn't work, now you must do the following.
After the Half-life update on Steam unzip the file radalert into the following directory:

C:Program FilesSteamSteamAppscommonHalf-Life

The game should appear in the library.

If the game is lagging try software mode.
Change between opengl and software mode:
I can change between each tab in the options(if software mode is activated) when i click below the buttons, or at the lower border.

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