The file was missing in the first upload of the udpate files. You can get it here: https://mega.nz/file/LlZExJDL#BVYpH1srR6YCcHDF6mB9mxa0ZoCdfDAASP885iCCVeQ
Add the file to the js/plugins folder, and the error message shouldn't appear anymore.
Saves can be used in fresh downloads of the full game version, you just have to copy&paste the entire save folder, including the global file.
1. You can access locations via the worldmap where you walk around, not via the overview map on which you build and upgrade constructions.
The overview map has a turn system. You need to use the "end turn" button to advance the turns.
2. On the overview map? Build a lumberjack.
3. Check the paperwork on the desk in your bedroom.
4. Fight vanguard battles. You get equipment and items as rewards for defeating enemies, opening chests, and winning battles.
5. That probably means that you're missing a prior step for Mira's events.
In that case, he can be found in the bar in Aldlyn. But that's where his story ends when you decide to return him to male.
You need the "Monster Craft Recipe" to craft those things, which you get from Vivian after the events of capturing monsters allowed you to build a monsterhall in your castle.
That comment by Trey is about Mirel's event. They continue in her events, not in Trey's story.
