Optional complementary installer
We have lost our installer by moving to Kiwix Desktop 2.0. Ticket is outdated.
Remove or fix "see also" templates linking non-included pages
Your approach to solve the problem is not realy feasible. I think the solution would be to have categories working (there is an issue on Github for that)... Or just remove the whole template via a blacklist (but so far this is not configurable that way). Closing, but issue can be reopen on GitHub if really important.
Preserve linking in {{russo}} to [[Lingua russa]]
I believe this is fixed, see https://library.kiwix.org/viewer#wikipedia_it_all_maxi_2024-03/A/Aleksandrovsk-Sachalinskij
Citation style
We get the HTML directly from the API of Wikipedia, this is not something we decide.