The effect from ‘change of delivery type’ upgrade

ETS 2 has a file contains info about levels. Here is fragment of that file:

#   Level names "level_limit|level name" 
# 
level_names[]: "0|@@lvl_name0@@|0xFFe0e0e0" 
level_names[]: "5|@@lvl_name1@@|0xFF45c294" 
level_names[]: "10|@@lvl_name2@@|0xFF75baea" 
level_names[]: "15|@@lvl_name3@@|0xFF3a88f4" 
level_names[]: "20|@@lvl_name4@@|0xFF5847f0" 
level_names[]: "25|@@lvl_name5@@|0xFFda9356" 
level_names[]: "30|@@lvl_name6@@|0xFFf58493" 
level_names[]: "40|@@lvl_name7@@|0xFFc99ef2" 
level_names[]: "50|@@lvl_name8@@|0xFFc2f9ff" 

# 
#   experience points to the next level 
# 
level_xp[0]: 200 
level_xp[1]: 500 
level_xp[2]: 700 
level_xp[3]: 900 
level_xp[4]: 1000 
level_xp[5]: 1100 

It is easy to conclude that after level 50 your name of rank will stay the same. And the maximum level, according this long file, is 150 (but I can't say for sure if any new patch changed that, it's confirmed after patch 1.2.5).

For official DLC will be automatically activated and you should see the content in your game. Drive to maintenance and check your paint jobs there (not your own garage!)

For mods you will need to go to your profiles, click edit and enable all of the necessary mods. You should now see the content in your game. Again, remember to check at a maintenance garage (again, not your own garage).