In 1.0.2 beta client they changed the .pkg names for tank textures.
To make BTW work you need to change a few lines in 'PackageManager.py' file.
Possible path: C:\Program Files\Blender Foundation\Blender\2.79\scripts\addons_contrib\tank_viewer
pkg_filename_list = (
'vehicles_level_01_hd.pkg', 'vehicles_level_01.pkg',
'vehicles_level_02_hd.pkg', 'vehicles_level_02.pkg',
'vehicles_level_03_hd.pkg', 'vehicles_level_03.pkg',
'vehicles_level_04_hd.pkg', 'vehicles_level_04.pkg',
'vehicles_level_05-part1.pkg', 'vehicles_level_05-part2.pkg', 'vehicles_level_05_hd-part1.pkg', 'vehicles_level_05_hd-part2.pkg',
'vehicles_level_06-part1.pkg', 'vehicles_level_06-part2.pkg', 'vehicles_level_06_hd-part1.pkg', 'vehicles_level_06_hd-part2.pkg',
'vehicles_level_07-part1.pkg', 'vehicles_level_07-part2.pkg', 'vehicles_level_07_hd-part1.pkg', 'vehicles_level_07_hd-part2.pkg',
'vehicles_level_08-part1.pkg', 'vehicles_level_08-part2.pkg', 'vehicles_level_08_hd-part1.pkg', 'vehicles_level_08_hd-part2.pkg',
'vehicles_level_09-part1.pkg', 'vehicles_level_09-part2.pkg', 'vehicles_level_09_hd-part1.pkg', 'vehicles_level_09_hd-part2.pkg',
'vehicles_level_10-part1.pkg', 'vehicles_level_10-part2.pkg', 'vehicles_level_10_hd-part1.pkg', 'vehicles_level_10_hd-part2.pkg',
'shared_content-part1.pkg', 'shared_content-part2.pkg', 'shared_content_hd-part1.pkg', 'shared_content_hd-part2.pkg',
'shared_content_sandbox-part1.pkg', 'shared_content_sandbox-part1.pkg', 'shared_content_sandbox_hd-part1.pkg', 'shared_content_sandbox_hd-part2.pkg',
'hangar_v3_hd.pkg', 'hangar_v3.pkg'
)
Don't forget to backup the original file.