For those still having issues with tank models not importing you can change the following in PackageManager.py
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-part1.pkg', 'shared_content_sandbox-part2.pkg',
'shared_content_hd-part1.pkg', 'shared_content_sandbox_hd-part2.pkg',
'hangar_v3_hd.pkg', 'hangar_v3.pkg'
)
Solution previously mentioned here.
In addition, there seems to be an issue with just rendering a black tank, to fix this just make sure you have your desired renderer selected before you load the tank.