the logfile is an absolute mess, without any line breaks shown... but there is your problem:
2025-02-28T13:57:49 0.565 INF Command line arguments: "C:\Program Files (x86)\Steam\steamapps\common\7 Days To Die\7DaysToDie.exe" -force-d3d11 -disablenativeinput -nogs -UserDataFolder=D:\SteamLibrary\steamapps\common\7 Days To Die\Mods -logfile C:\Users\Mike\AppData\Roaming\7DaysToDie\logs\output_log_client__2025-02-28__13-57-11.txt
UserDataFolder is not found:
2025-02-28T13:57:51 3.128 EXC Could not find a part of the path 'D:\SteamLibrary\steamapps\common\7'.
at System.IO.FileSystem.CreateDirectory (System.String fullPath) [0x00145] in <31687ccd371e4dc6b0c23a1317cf9474>:0
at System.IO.Directory.CreateDirectory (System.String path) [0x0002c] in <31687ccd371e4dc6b0c23a1317cf9474>:0
at Platform.EOS.Api.createPlatformInterface (Platform.EOS.EosCreds _creds, System.Boolean _serverMode) [0x00125] in <0a824c04d551409fad5953ac8c5c40be>:0
at Platform.EOS.Api.initPlatform (Platform.EOS.EosCreds _creds, System.Boolean _serverMode) [0x001af] in <0a824c04d551409fad5953ac8c5c40be>:0
at Platform.EOS.Api.InitClientApis () [0x0001e] in <0a824c04d551409fad5953ac8c5c40be>:0
at Platform.AbsPlatform.Init () [0x00240] in <0a824c04d551409fad5953ac8c5c40be>:0
at Platform.PlatformManager.Init () [0x0019d] in <0a824c04d551409fad5953ac8c5c40be>:0
UnityEngine.StackTraceUtility:ExtractStringFromException(Object)
Log:Exception(Exception)
Platform.PlatformManager:Init()
d__8:MoveNext()
UnityEngine.SetupCoroutine:InvokeMoveNext(IEnumerator, IntPtr)
1) Your "UserDataFolder"-parameter contains spaces in the path name. In order to work as a command line argument, like above, you have to use it with quotes around it.
2) Are you really sure, this is your user data folder? By default, the user data folder is within your profile (appdata) - see what happens, if you completely remove this argument. Default will be used automatically than...