Installing DUNNO — step-by-step guide

Why you will see warnings (and why that is normal)
DUNNO is also available in the Google Play Store — you chose the direct download. That version gives you maximum privacy: no Google account involved, no registration of who installs the app, nothing shared with Google. You buy and download directly from the maker.
Because this app file does not come from the Play Store, Android and Google show a few standard warnings. These warnings appear for every app installed outside the Play Store — they are not about DUNNO specifically. This guide walks you through each one.

Before you start

Have your personal download link ready (you received it after purchase).
Use Wi-Fi — the app is about 112 MB.
Important: open the app within 2 days after downloading. DUNNO does a one-time activation check on first start; after that it works without time limits.
These pictures were made on a standard Android phone with Chrome. On some brands (Samsung, Xiaomi…) the texts can differ slightly — the steps are the same.

1Open your link and tap Download

Open your personal link on your phone and tap the Download button. The download of the app file (an "APK") starts.

2Chrome: "File might be harmful" → tap "Download anyway"

Tap "Download anyway".

Why this appears: Chrome warns about every app file downloaded from the internet instead of the Play Store. It does not mean anything is wrong with the file — it is the file your personal link was made for.

3Open the downloaded file

When the download finishes, tap the notification (or find the file in the Downloads folder of your Files app) and tap it.

Your phone may now say it is not allowed to install unknown apps from this source. Tap Settings.

Dialog: not allowed to install unknown apps

Tap "Settings".

Why this appears: Android blocks installs from outside the Play Store until you give permission once — per app you install from (here: your browser or Files app).

4Turn on "Allow from this source"

Switch the toggle on, then go back (top-left arrow).

Why this is safe here: you are only allowing this source (your own download). After the installation you can switch this off again — see "After installing".

5Tap "Install"

Question: Do you want to install this app?

Tap "Install".

6Play Protect: "Unsafe app blocked" → "More details" → "Install anyway"

Google Play Protect may show a warning. First tap More details:

Tap "More details"…

…then tap Install anyway:

…then "Install anyway".

Why this appears: Play Protect says it "doesn't recognise this app's developer". That is expected: this direct version of DUNNO is not distributed through Google, so Google has never seen it. "Unsafe" here means "unknown to Google", not "dangerous". Every DUNNO app is signed with the maker's own key, and your copy was prepared personally for your link.

7Open DUNNO — within 2 days

Tap Open (or find DUNNO in your app list). The first start does a one-time activation: do this within 48 hours after downloading. After that, the app is yours — no accounts, no ads, no tracking.

After installing (optional but tidy)

Turn the permission off again: Settings → Apps → your browser (or Files) → "Install unknown apps" → switch Allow from this source off.
Delete the downloaded APK file from your Downloads folder — you don't need it anymore.
Keep your personal link safe. It is your proof of purchase: you can use it to download the app again (for example after a new phone) and to get updates. Your link allows 10 downloads.

Updates: new versions arrive through the same personal link: open it, download, install. The warnings from steps 2 and 6 may appear again — they mean the same thing as before. Updates install over the existing app; your conversations and keys stay on your phone.

Help

Something not working?

"Play Protect blocked this app" — and there is no "Install anyway" button

In rare cases Play Protect fully blocks an app instead of showing "Install anyway". For DUNNO this should not happen. If you see it, first make sure you downloaded from your personal dunno.my link, then tap More details and choose Install anyway if it is available. If there is truly no way to continue, contact dunno.download@gmail.com.

"App not installed"

Usually one of these three: the download was incomplete (download the file again over a stable connection), there is not enough storage space on the phone, or the phone is very old and its Android version is too low. DUNNO requires Android 8.0 (2017) or newer.

"This app was built for an older version of Android"

Some Android versions show this message for apps that also support older phones. Tap Install anyway — DUNNO works fine on current Android versions.

"How do I install the Play Store version?"

Install DUNNO straight from Google Play with your Google account — you will not see any of these warnings. Try it free for 14 days, then keep it for €5.99 per year via Google Play Billing. This guide is for the direct (Bitcoin) download version instead.

Questions people ask

"Is this a virus? Why is my phone warning me?"

No. The warnings are standard messages for any app that does not come from the Play Store. Android cannot tell the difference between a trustworthy independent app and a bad one, so it warns about all of them. You are installing DUNNO's direct version — deliberately outside the Play Store, to keep Google (and your data) out of it.

"DUNNO is also in the Play Store — so why this direct version?"

Correct, both exist. The Play Store route requires a Google account and Google registers your purchase and installation. The direct version you bought shares nothing with Google: no account, no registration, no update tracking. That extra privacy is exactly why the warnings in this guide appear — they are the price of leaving Google out of it.

"Can I install DUNNO without these warnings?"

Yes: the Play Store version installs without any warning, because it goes through Google (with a Google account and Google's registration). You chose the direct version instead — this guide gets you through it in a few minutes.

"The warning on my phone looks a bit different."

Phone brands (Samsung, Xiaomi, Oppo…) and Android versions word things slightly differently. Look for the equivalents of Download anyway, Allow from this source, More details and Install anyway — they are always there.

"My link says the download limit is reached."

Your link allows 10 fresh downloads (resuming an interrupted download doesn't count). Contact us from the email address you bought with, and we'll reset it.

"I waited too long and the app says the activation window expired."

Download the app again through your link (that gives you a fresh activation window) and open it within 48 hours.

Screenshots of the standard Android/Chrome warnings are reference images from public sources (Android Authority, TotalAV support knowledge base, Stechies). The screens on your phone may differ slightly by brand and Android version.

Installing DUNNO on your Android phone