Thumbs down Problem isntall xPosed on bluestacks 0.8.12.3119

Hi

I want to install xPosed on bluestacks 0.8.12.3119 version. I 've downloaded the xPosed installer, then I clicked on and clicked on framework/install/update

I have an error message:

Carte SD:/mnt/sdcard/android/date/de.robv.android.exposed.installer/files

Copy of Xposed-disabler-recovery.zip...

Montage de /system en écriture ( writing I think, sorry the message is in french)

cp: can't create ' /system/bin/apps_process.orig' : Read- only file system

Echec de la création d'une sauvegarde de /system/bin/app_process which I think could be translated in

failure of the backup of /system/bin/app_process


I'm a beginner in this and in xposed so please answer the more precisely you can.

Thank you in advance