Steam monitors and inspects the "local content" of the games which you install on your PC under its control, such as IL-2 Cliffs of Dover. If Steam is running and you attempt to install the patch, Steam will likely detect that the installation directory has been tampered with in some way and cannot be trusted. It may then tell you "Update is required" for IL-2, force you to re-download the original files/data from the broken vanilla version, and reverse the changes you've patched into your game installation.
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To prevent this from happening (permanently), so that you can modify and tweak your own IL-2 installation however you like, when you re-open Steam again then do this before playing ...
- Click on the "Library" tab ... select "Games" ...
- On left-hand side of your Steam window, you'll see a column listing all Steam-based games installed on your system ...
- Right-click on IL-2 ... choose "Properties" ...
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If your chosen auto-update settings are set to "automatically update", then either turn it off (never update) or set it to the "Only update this app when I launch it" setting ... even though it says "[...] update when I launch", it actually doesn't do anything, at all ... at least not for IL-2 ... so, it's the same as telling Steam "do
not update or worry about this game for me anymore", or "requires my permission before you mess with this ever again" ...
At that point, Steam will leave your IL-2 installation alone (which is what we want) ... taking this responsibility into your own hands, however, means that Steam will now fully neglect it, no longer worrying about what you do to the locally installed data or how out of date your game may be, so it'll be up to you, from now on, to update IL-2 when Team Fusion releases new community patches and/or mods, and to try take good care of your game installation(s) files and folders.
If you just want to play single-player mode, offline, however, then you technically don't ever have to do anything else. IL-2 should now launch and run for you and enable you to play single-player (offline "quick missions", "singles" and "campaign" mode, with AI flying all other non-player aircraft in the game world) ...
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