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To install the Royal Thai Airforce 20th Anniversary livery follow my instruction ; 

1 : Browse to the folder where you installed your DCS World OpenBeta
2 : Open the following folders Coremods/aircraft/L-39/Liveries/L-39C/
3 : Drop the folder Royal Thai Airforce 20th Anniversary there
4 : Ingame select the livery on one of the following nations ; 
"CZE","USA","RUS","FRA","UKR","SPN","NETH","TUR","BEL","GER","NOR","CAN","POL","DEN","UK","GRG","ISR","ABH","RSO","ITA"
5 : Enjoy   

If you like my work then leave a message on the forum or let me know. 
I hope you enjoy flying the Thai airforce L-39 :)

Greetings Mainstay

                                                                                                                                            
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