[Xiaomi Redmi 3s ROMs, Kernels, Recoveries, & Other] moralesnery:
Seems like there's a some confusion because the README file inside the gdrive folder hasn't been updated for a while. The OP instructions works fine, but I think that would be cool to add a "make a factory reset" final instruction when doing a clean install.

Google Drive

Open Gapps

Steps that I followed to get the April 05th build:

Download the latest build, it's on the root of the gdrive folder provided in the OP

Download the latest gapps for Android 6.0 arm64, I used nano package from Open Gapps

Also download the TWRP build that fedosis made, its inside the TWRP folder in the gdrive.

If haven't done already, flash the TWRP img using fastboot.

Boot into TWRP using button combination (both vol buttons and power)

Once into TWRP, go into wipe > Advanced wipe > select everything except MicroSD and USB OTG and then "Swipe to Wipe"

When the wipe ends, press the virtual home button, then go again to Wipe > Advanced Wipe. Select data partition, press "Repair or change filesystem", then press "Change filesystem" and select "F2FS".

When it ends, do the same with the cache partition. /data and /cache will be f2fs, and the rest will stay as ext4.

When it ends, press the home virtual button and then go to Reboot > Poweroff. The phone will reboot and get stuck on MI logo, don't worry.

In the Mi logo, press the power button until the phone powers off. Inmediately and quickly press both volume buttons and power. If you did it correctly, you will go into recovery again. If not, try again.

Once inside TWRP, connect the phone to your PC. Transfer the rom zip file that you downloaded to inside the TWRP folder inside the internal storage.

Donwload the "cm_setup_fix" zip file inside the "Patches" folder inside fedosis' gdrive, and transfer the file to the TWRP folder inside the phone's internal storage

On your phone, inside TWRP go to Install >and select the ROM zip file. Then, press the "add more zips" button and select the cm_fix zip file. Then, "Swipe to confirm flash" and the flashing process will begin

When it ends, press the "Boot to system" button. First boot will take less than 10 minutes.

You'll note that there's no wizard, just the screen without password. Check that wifi and network works, check that you can swipe down the notification bar and the quick tiles. If everything's okay, power off the phone.

Boot into recovery again (both volume buttons and power until the MI logo shows up)

Transfer the gapps zip package to TWRP folder inside the phone's internal storage

In TWRP, go to Install > select the gapps zip file, then "Swipe to confirm flash"

When it ends, press the home virtual button. Then go to Wipe > "Swip to factory reset". When it ends, press the "boot to system" button.

Wait 5-10 minutes and the wizard will show up, and you have your clean install.

------------------------------------------------------------------------------------------------------------------------------------------------

There's a lot of people in spanish-spoken countries coming to this forum having problems translating correctly, so I will post the translated instructions. Hope this doesn't go against the rules and if it does just say it and I'll remove it.

I don't like asking for "thanks" but in this case it would help to keep this post visible for the newbies, specially the newbies. Thanks in advance and sorry for any inconvenience.

Google Drive

Open Gapps

Pasos que seguí para instalar la build del 5 de abril:

Bajar la ultima build de la ROM, está en la raiz del Google drive de fedosis.

Bajar las ultimas gapps para Android 6.0 arm64, yo use Open Gapps

Bajar el TWRP modificado que hizo fedosis, está en la carpeta TWRP en el google drive

Si no lo habías hecho antes, instalar este TWRP usando fastboot o el TWRP Installer que está en la carpeta.

Inicia en modo recovery (ambos botones de volumen y el power hasta que se vea el logo de MI).

En TWRP ve a Wipe > Advanced wipe > selecciona todo menos MicroSD and USB OTG luego desliza donde dice "Swipe to Wipe"

Cuando termine aprieta el boton home virtual,ve de nuevo a Wipe > Advanced Wipe. Seleciona solo data, toca "Repair or change filesystem", luego toca "Change filesystem" y escoge "F2FS".

Cuando termine, haz lo mismo con la partición cache. /data y /cache van a ser tipo F2FS, el resto se quedan como ext4.

Cuando termine aprieta el boton home virtual,ve a Reboot > Poweroff. El telefono se va a reiniciar y se va a quedar atorado en el logo de MI, no te preocupes.

Presiona el boton power hasta que el telefono se apague. Enseguida y muy rapido aprieta los dos botones de volumen y el power hasta que se encienda. Si lo haces bien vas a entrar a TWRP, si no intenta otra vez

En TWRP, conecta el telefono a la computadora. Copia el zip de la ROM a la carpeta TWRP del almacenamiento interno.

Descarga el archivo "cm_setup_fix" que está en la carpeta "Patches" del google drive de fedosis, copialo tambien al almacenamiento interno del telefono.

En TWRP en el telefono ve a Install > y selecciona el zip de la rom. Luego toca "add more zips" y selecciona el archivo cm_fix Luego desliza donde dice "Swipe to confirm flash" y espera que se termine de instalar todo.

Cuando termine, toca "Boot to system". El primer inicio tarda como 10 minutos.

Vas a notar que no hay asistente de inicio, solo la pantalla sin contraseña. Revisa que tengas wifi, datos, que puedas ver el menu de notificaciones y los quick tiles. Si todo está bien, apaga el telefono y vuelve a entrar a recovery.

Copia las gapps que bajaste, a la carpeta TWRP del almacenamiento interno.

En TWRP, ve a Install > selecciona el archivo de las gapps, luego desliza "Swipe to confirm flash".

Cuando termine presiona el boton home virstual. Luego ve a Wipe > "Swipe to factory reset". Cuando termine, toca donde dice "boot to system".

Espera de 5 a 10 minutos, y al iniciar vas a ver que te sale el asistente inicial de Android. Listo.