The addon checkbox is greyed out
When Bookmap will not let you tick Norden Statistics, and what is and is not your install.
The symptom
You added the addon in Settings, Configure add-ons, it appears in the list, and the checkbox beside Norden Statistics will not tick. Bookmap may mention API modules not being allowed.
What it is
That is a Bookmap restriction, not a broken install. Bookmap decides which addons a given account and feed may run, and nothing you change on your own machine lifts it. You did not do anything wrong and reinstalling will not move it.
Tell us with a ticket about the addon and we will take it from there. Say which instrument you were on and which feed you are running, because the restriction is not the same on all of them.
Your trades still reach the dashboard
While the box is greyed the addon records nothing, but the connector also reads the files Bookmap's own Trading Statistics panel writes. Keep that panel open while you trade and your closed trades arrive as before: Bookmap rewrites its export roughly once or twice a minute, and the connector sends what is new. What does not arrive is the market around your orders: the queue, the spread at placement, and whether the entry rested or crossed. The coach's lines about placement have less to read on those days.
Keep one recorder on
Once the addon is ticked it writes everything the panel would, in the same format, so the panel is no longer needed. If both record the same session, its trades count once when one copy holds every trade of the other, and your Journal shows them once, from the copy that counts.
Where neither copy holds the other, for example when the two disagree on a trade or, in live trading, do not name the same account, the trades they share count twice, as they can in the simulator or in replay and for up to a day while one copy is still arriving. Both copies stay visible. Keeping one recorder on is what keeps every figure counted once. If a day's figures look doubled, tell us with a question about my numbers and name the date.
Two things that look the same and are not
The box unticks itself after a restart. That is not the restriction. Bookmap remembers the file by its location, so if the addon file moved, or it is still sitting in Downloads, the entry goes stale. Move the file somewhere permanent, remove the old entry in Configure add-ons, and add it again from its new home.
The box is ticked and one instrument still records nothing. The tick is per instrument. If you trade ES and NQ, it has to be ticked on ES and on NQ. An instrument you forget records nothing. Its trades reach the dashboard only if Bookmap's own export records them, and then with no order or market readings; otherwise they never arrive, and no total, rule or alert covers them. Nothing warns you either way.
When a newer addon comes out, remove the old entry in Configure add-ons before adding the new one. Two entries for the same addon is its own kind of confusing.
What the addon records, and where
It records your order events and a market file for each instrument you tick, for each second it is open in Bookmap, whether you trade or not: the best bid and ask with their sizes, the sizes on the nearest price levels, and that second's totals of depth, trades and volume, never the raw feed. It records nothing from other applications and nothing at all while Bookmap is closed.
The recordings sit in a folder called NordenMarket in your home directory and delete themselves after two weeks.
To stop recording, untick the box. To take it out of Bookmap entirely, use Remove in Configure add-ons.