Other tank skin mods would conflict with hitzone skins.
In game camo shouldn't matter at all.
Given the tier of tank you mentioned, it could simply be there isn't any hitzone skins made for those tiers - once place I looked mentioned KoreanRandom's set being primarily for tier 8-10 with a few others added in lower tiers.
Looks like you have a problem regarding mods stored on my online server, either the 7zips downloaded by installer has been corrupted in the process or an antivir is preventing them to be downloaded properly, or in a rare case you have an usuall windows settings that are messing up installation.
If possible show that on screenie.
Good luck.