Thank you @rfalc, I am not a Windows user so I am looking at defining the problem exactly!
Herolte install notes
You did all this, you got a red error message, and you found yourself out of options at the last line I am quoting?
Now you’re in TWRP, congratulations, you’ve done the hardest part. Let’s detail the following procedures in several sub-steps.
A) Delete existing smartphone content
Before you reach the main menu, a message may ask you if you want to open TWRP read-only (i.e. no risk of deleting or changing anything) or not. This option shouldn’t be chosen (since we want to install a new operating system). Slide the bottom arrow from left to right.
TWRP may also ask you for a password, which is your phone password.
Once in the main menu, click on “Wipe” then “Advanced Wipe”.
Select the following items to delete and nothing else :
Dalvik / ART Cache
Data
Internal Storage
cache
system
Validate by dragging the “Swipe to Wipe” arrow from left to right.
If red error messages show up, your phone is probably encypted but TWRP can’t decrypt the /data partition (it’s a common issue on Samsung phones).
To solve that problem, go to Wipe > Advanced wipe, select “data”, click on “Repair or Change File System”, then on “Change filesystem”. Select exFAT (or another one if it doesn’t work, it doesn’t matter), then swipe from the left to the right. Redo the manipulation but this time select ext4 (which is the original file system) then slide from the left to the right.
Did you note what the red error message said?
What Android version did your phone have before you started work?
Are you sure you removed your Google account before you started? Did you do a Factory reset before you started?