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From the Downloads section here:
Grab the Installer (Bundled with Doomseeker) for your OS
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Install with default settings
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Download DOOM.WAD and DOOM2.WAD from:
Press Windows Key + R (or click Start then Run), then run C:\Users\%USERNAME%\AppData\Local\doomseeker
Move DOOM.WAD and DOOM2.WAD into that folder
(C:\Users\YourName\AppData\Local\doomseeker\)
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You can actually put them wherever you want, but you'll have to set that directory in Zandronum's file paths
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Run Zandronum (which actually opens Doomseeker)
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Click OK
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Go to Pinned Servers
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Add doom.fecalmatter.ca 51084
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Update Zandronum if you see this
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Restart and Install
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Double click on the server we pinned which will be at the top
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Click Install
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The needed files auto download
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Game loads
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Note that you'll be pressing Spacebar to join when ready
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Once in game press Esc for menu, go to Options, Player Setup and change your name and color
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In Options, Set Video Mode you can change your resolution. You may have to select aspect ratio 16:9 to see your resolutions. I couldn't go past 1280x720 without scaling issues
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The only key map I had to assign was kick and grenade but go crazy if you like