How can I install COD 1 and United Offensive (1.5 and 1.51) patch on windows 10?

World War II PC

Hi. I recently installed COD 1 and United Offensive add on, on my windows 10. The version of main game is 1.3 and the add on is 1.41. Now I want to install version 1.5/1.51 patch on both of them but I get a error message like this:

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So how can I get rid of that?

(PS: I've already tried to install v1.4 patch on main game but I got the same error message).

HammHamm
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mattiedog27
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