You need to have all 2018 SX tracks in your personal folder.
http://forum.mxsimulator.com/viewtopic.php?t=47877
Password:
he4wutRUSwa?hAcHamu@esa5ejut2aTr
Track Links
High Res
Medium Res
1/2 the texture sizes of high res
Medium Res V2
High decal textures. Medium model textures
Low Res
1/2 the texture sizes of medium res
Ultra Low Res
1/2 the texture sizes of low res