Click on MISC files and add your custom pack (*.zip archive) -> must be same version as File System.
Exp.
W580_R8BE001_MAIN_GENERIC_LA_RED52
W580_R8BE001_FS_EUROPE_3_RED52
HB1-06_Gen_CDA102568_12_R8A_GENERIC_EUROPE_3
OR
W580_R8BE001_MAIN_GENERIC_LA_RED52
W580_R8BE001_FS_BALTIC_RED52
HB1-06_Gen_CDA102568_1_R8A_GENERIC_BALTIC
OR
W580_R8BE001_MAIN_GENERIC_LA_RED52
W580_R8BE001_FS_CENT_EUROPE_RED52
HB1-06_Gen_CDA102568_207_R2A_GENERIC_CENT_EUROPE