ESP Zener Cards Free
v1.2 · 87.8 KB · code 1
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File information
UpdatedNov 29, 2011
PublishedNov 29, 2011
Packagecom.marplotter.zener_free
Versionv1.2 (1)
Size87.8 KB
MD52a7bb6b8f9533be8a8516365bdd2930f
Min SDK3
Malware scanWARNING
Signature SHA101:A1:D8:AF:00:62:A4:37:86:5A:F0:3B:DB:BF:A1:9B:B5:7D:C7:07
SignerCN=J Farringdon, OU=NA, O=marplotter.com, L=Pittsburgh, ST=PA, C=US, [email protected]
Total downloads819
This version819
Age ratingEveryone
Security scan
WARNING
- Developer signature verified 2025-03-07
- Scanned for malware 2020-10-08 06:03:50
- Signature SHA1 01:A1:D8:AF:00:62:A4:37:86:5A:F0:3B:DB:BF:A1:9B:B5:7D:C7:07
- File MD5 2a7bb6b8f9533be8a8516365bdd2930f
How to install ESP Zener Cards Free v1.2 on Android API 3+
Takes about 2 minutes. You'll need roughly 87.8 KB of free storage.
- Grab com.marplotter.zener_free_1.apk — hit the Download button above (87.8 KB). If your browser warns about APK files, choose Keep or Download anyway — that warning fires on every APK, not just this one.
- Trust your browser to install — on Android 8+ go to Settings → Apps → Special access → Install unknown apps, pick the app you downloaded with (Chrome, Firefox, Files, etc.), and flip Allow from this source. On older Android, toggle Unknown sources under Security.
- (Optional) Verify the file — compute the MD5 of the downloaded APK and make sure it matches 2a7bb6b8f9533be8…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.marplotter.zener_free_1.apk in your Files app under Downloads, then tap it. Android's package installer will appear.
- Check the signer — the install screen will name the publisher. For this build it should read CN=J Farringdon, OU=NA, O=marplotter.com, L=Pittsburgh, ST=PA, C=US, [email protected]. If it doesn't match, cancel — you have the wrong file.
- Review permissions & tap Install — scroll the permission list, then confirm. If Play Protect flags it, tap Install anyway (this APK was scanned as WARNING).
- Done — open ESP Zener Cards Free — tap Open on the install screen, or find the ESP Zener Cards Free icon in your app drawer.
Common install errors for ESP Zener Cards Free
- "App not installed" — usually means an older or differently-signed version is already on your device. Uninstall it first, then retry. Your data may be lost unless you back it up.
- "Parse error" — the APK is for a newer Android than yours. This version needs Android API 3 or later. Pick an older build from the versions list below.
- "There was a problem parsing the package" — the download was interrupted. Delete the file and re-download over Wi-Fi.