[Galaxy Tab Pro 12.2, 10.1, 8.4 Q&A, Help & Trouble] burnersk:
I have a Samsung Galaxy Tab 10.1 WiFi (SM-T520, picassowifi, n2awifi).

I want to have LineageOS 14.1 (nightly build of 2017-05-18). In comparison to the stock ROM (Android 4.2.2), LineageOS offers me a more current version of Android including "more current" security patches.

Furthermore I already use LineageOS on my smartphone so I am familiar with the LineageOS ROM.

So much for my motivation. Here comes the issue with it...

I went over to wiki.lineageos.org/devices/n2awifi/install to review the installation instructions for LineageOS on my tablet variant (there mentioned as "n2awifi"). I see references to Heimdall which I never was able to properly "install" (more precisely the drivers) so I use my own perfectly working way I describe now:

I went over to download.lineageos.org for receiving the latest (as of 2017-05-25) nightly (only nightlies are available at this time) of LineageOS 14.1 for my tablet variant (there mentioned as "n2awifi"). The version I took was "lineage-14.1-20170518-nightly-n2awifi-signed.zip".

I went over to https://eu.dl.twrp.me/picassowifi/ for receiving the latest (as of 2017-05-25) build of the TWRP recovery image for my tablet variant (there mentioned as "picassowifi"). The version I took was "twrp-3.0.2-0-picassowifi.img.tar".

Edit: 3.1.1 was already out but I discovery random crashes and reboots with it. So I went back to the known stable 3.0.2.

I went over to www.sammobile.com/firmwares/ for receiving the latest (as of 2017-05-25) build of the Odin tools to flash TWRP recovery onto my tablet variant (there mentioned as "SM-T520"). The version I took was "Odin v3.11.1".

I went over to developer.samsung.com to receive the latest (as of 2017-05-25) build of the SAMSUNG Android USB Driver for Windows. The version I took was "Feb 10, 2015".

I went over to opengapps.org for receiving the latest (as of 2017-05-25) build of the OpenGApps package. The version I took was "open_gapps-arm-7.1-nano-20170525.zip".

I downloaded the latest Android Platform Tools directly from Google and extract it into my home directory (Windows). I extend the PATH variable with the directory I just extracted to be able to use just "adb" in any to access the adb application which is now within that extracted directory.

I started my tablet into the Download environment (ODIN mode).

I flashed the TWRP recovery image (tar ball) with Odin.

I restarted my tablet into the Recovery environment (now TWRP).

I wiped out everything on the tablet. using TWRP wipe option. Like system, data, both caches, internal storage.

I startet TWRP's ADB Sideload mode.

I sideloaded the LineageOS ZIP package onto the tablet.

I performed a factory reset. Notice: I did not install any other software (like OpenGApps) onto the tablet.

I performed a restart and complete the LineageOS installation procedure. As of now everything works fine expect that no Google application where installed (like Google Play store for getting apps).

I restartet my tablet into the Recovery environment (TWRP) again and like before wiped out everything.

I startet TWRP's ADB Sideload mode.

I sideloaded the LineageOS ZIP package onto the tablet.

I sideloaded the OpenGApps ZIP package onto the tablet.

I performed a factory reset. Notice: Now GApps are already installed onto my tablet.

I performed a restart and try complete the LineageOS installation procedure. Unfortunately the installation wizard crashes on the second step.

LineageOS welcome screen: <Next>

Language selection: "English (United States)": <Next>

Welcome to your SM-T520 screen: "Set up as new"

Error message: "Setup Wizard has stopped"

Of course there was an option to "Open app again" but this just results into getting to the language selection page again (step 2).

Since I cannot reach the developer tools to enable ADB I cannot access the logs, right?

I this behavior known? How can I supply helpful log files in this situation?