cannot execute AppImage file

Describe the bug:
Cannot run AppImage file after making it executable.

Steps to reproduce the behavior:
1. Download AppImage file from https://www.criptext.com/
2. From terminal in downloaded location: Open and use the following command
chmod +x Criptext-latest.AppImage
3. ./Criptext-latest.AppImage

error:
[8925:0418/162958.754268:FATAL:setuid_sandbox_host.cc(157)] The SUID sandbox helper binary was found, but is not configured correctly. Rather than run without sandboxing I'm aborting now. You need to make sure that /tmp/.mount_Criptebo1dEn/chrome-sandbox is owned by root and has mode 4755.
Trace/breakpoint trap

Device and System information (please complete the following information):
Device: Desktop
OS Version: MX-19.1 "patito feo"
App Version: Latest stable version from website (18 Apr 2020)

Inizia riproducendo il comando di avvio di AppImage nell’ambiente MX-19.1 segnalato e analizza il packaging AppImage o la configurazione di build dell’applicazione. Il lavoro è completato quando l’AppImage scaricato si avvia senza l’errore chrome-sandbox segnalato e il risultato è stato verificato sulla configurazione interessata.

Scritto dal modello di indicizzazione a partire dal testo della issue.