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Please have downloaded the whatsapp plus but whenever I wanna install it, this is the message I always get

You still have whatsapp installed in your phone.

To install whatsapp+ you need to uninstall whatsapp

I uninstalled it but still the same thing

eniogo:
I uninstalled it but still the same thing

go to settings>apps>all>press meny key>reset data

or remove ur sd card and install the app to phone, if it's still the same install it to sd card, or u can go to sd phone/sd card memory open these folders android>data, then try to look for the name of the app there or delete data folder entirely(note: this'll restore all ur apps data).. if any of those still didn't work, then u probably have a corrupt phone or memory storage/app(i.e. the watsapp, download it again),
if possible, back up and format ur phone!

Looks like you're using a chink phone
Most of them have WhatsApp preinstalled.
You need root access to remove it.
If you have root access, use ES file explorer- or any Root File Explorer- navigate to /vendor->App>WhatsApp.apk
Then delete it.