Electrical engineering
v8.5.4c · 19.2 MB · code 805040
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File information
UpdatedOct 8, 2025
PublishedApr 24, 2020
Packagecom.do_apps.catalog_937
Versionv8.5.4c (805040)
Size19.2 MB
MD54a948e77ed12b0b898ae70168b037261
Min SDK19
Malware scanTRUSTED
Signature SHA1A2:44:79:71:62:10:F9:F3:05:1E:B4:1D:AF:A8:92:EC:B0:D2:CD:3E
SignerCN=, OU=, O=kirs26, C=
Total downloads50,000
This version50,000
DeveloperSvetlana Sidorova
Age ratingEveryone
What's new in v8.5.4c
Various minor fixes
Security scan
TRUSTED
- Developer signature verified 2020-04-24
- Scanned for malware 2020-09-07 12:42:46
- Signature SHA1 A2:44:79:71:62:10:F9:F3:05:1E:B4:1D:AF:A8:92:EC:B0:D2:CD:3E
- File MD5 4a948e77ed12b0b898ae70168b037261
How to install Electrical engineering v8.5.4c on Android 4.4 KitKat+
Takes about 2 minutes. You'll need roughly 19.2 MB of free storage.
- Grab com.do_apps.catalog_937_805040.apk — hit the Download button above (19.2 MB). 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 4a948e77ed12b0b8…. Any difference means the file is corrupted or tampered — delete and re-download.
- Open the APK — tap the download notification, or find com.do_apps.catalog_937_805040.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=, OU=, O=kirs26, C=. 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 TRUSTED).
- Done — open Electrical engineering — tap Open on the install screen, or find the Electrical engineering icon in your app drawer.
Common install errors for Electrical engineering
- "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 4.4 KitKat 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.