@JohnMHammer, again, thank you SO MUCH for your help. I would've lost hope by now had I been trying to do this alone!

Alright, so yes, I messed with the ini file, oops. Also, I only had an ini folder and not a 64 folder. What I had originally was:

[Launcher]
LastLocale=en
FirstRun=false
AllowMultipleInstances=true
UseHighResolutionGameData=true
WindowGeometry=@ByteArray(\x1\ xd9\xd0\xcb\0\x1\0\0\0\0\x1N\0 \0\0\\\0\0\x4\x1d\0\0\x2\x84\0 \0\x1N\0\0\0\\\0\0\x4\x1d\0\0\ x2\x84\0\0\0\0\0\0)
PreCache=true
SelectLastPlayedWorld=false
GameClientType=1

[User_1]
UserName=*************
WorldName_1=Evernight
LastPlayed_1=2021-05-25T09:46:44
UserFileName_1=en-LOTRO_Eula-html
UserAckTime_1=2019-04-10T17:56:38
UserFileName_2=en-LOTRO_TOS-html
UserAckTime_2=2019-04-10T17:56:38

AND THEN, what I did to it was:

[Launcher]
LastLocale=en
FirstRun=false
AllowMultipleInstances=true
UseHighResolutionGameData=true
ScreenMode=FullScreenWindowed
PreCache=true
SelectLastPlayedWorld=false
GameClientType=3
GraphicsCore=D3D9
WindowGeometry=@ByteArray(\x1\ xd9\xd0\xcb\0\x1\0\0\0\0\x1h\0 \0\0\xae\0\0\x4\x37\0\0\x2\xd6 \0\0\x1h\0\0\0\xae\0\0\x4\x37\ 0\0\x2\xd6\0\0\0\0\0\0)

[User_1]
UserName=********
WorldName_1=Evernight
LastPlayed_1=2021-05-25T15:09:21
UserFileName_1=en-LOTRO_Eula-html
UserAckTime_1=2019-04-10T17:56:38
UserFileName_2=en-LOTRO_TOS-html
UserAckTime_2=2019-04-10T17:56:38

------

So, I didn't have a Graphics or Screen Mode so I added those (but also see you said to make sure Client is 1 and not any other number). I'm gonna try that now and get back to you!