Shauren

No, Arctium Launcher is the only way.

No, I don't really care about mac clients, the current 8.2.5.32750 build being allowed for mac clients on TC is actually an exception, not a norm, it is the first one since 7.3.5

If you don't have a launcher then no, you need to use windows client

It sounds like you connect both worldservers into the same character database, you need to separate them and share only auth (and world if you dont want to customize anything for only one realm)

You need to use folder name (case sensitive) and version from .toc, timestamp is for cache, just set it to current time

Install MySQL 5.7, thats all you must do

You don't need the client at all after extraction (but you will need it again if there are fixes/changes done to extractors, to extract again), you can also delete Buildings

Ignore startup errors Allied races are not implemented

Repacks are not supported. Currently supported version is 8.2.0.31478 and you need to download new version of arctium launcher

You should either use SOAP from your website to connect to running worldserver and send .accont set password comand (preferred) or just clear s and v fields from auth.account (this method might go away in undetermined future)

This isnt a supported scenario, bnetserver has three separate build ranges that are incompatible with each other due to changes in client 6.0 to 6.2.3 6.2.4 to 7.2.5 7.3 to now

Fixed

You can be waiting for a long time since 7.3.5 is after all unsupported version

There is nothing wrong with extractors, they were left in working state Your game install must be broken (for example, missing .build.info file?)

Here, have mine https://paste2.org/PMN1IWYK