Unable to edit my post even the next day, writes "ERROR
You are only allowed to edit posts for 3600 second(s) after posting" even though more than 10 hours have passed

Closed. Solved in another way. Thanks support!

Where is the key? But nowhere!

I tried to install the missing key in the system manually. He just doesn't exist. Epic fail:

@jan-reitinger
Thanks for your reply.

• but Time, Timezone and Localization are correct;
• OS is actual Raspberry OS Buster (10) with successfully finished apt update with then apt upgrade. Dont say to me about Bullseye, Buster is in actual support and "Getting started with REXYGEN on Raspberry Pi
  User guide
  REX Controls s.r.o.
  Version 2.50.12
  2022-11-22" in "3.1.2 Manual installation" straight to say about "Replace bullseye with buster or stretch if you are still running the older Raspbian distribution". User even Stretch may using!;
• overmore than need is free space on disk;
• now this is fresh installed OS with correct settings of net with ping to google.com, raspbian.raspberrypi.org, archive.raspberrypi.org and download.rexcontrols.com;
• no problem with any installation of runtimes other manufacturers like Codesys or Mathworks. But nope, only Rexygen on start of installation disagree to interfaced;
• my interest is in test of communication of this three runtime. Both Codesys and Matlab models in theyr runtimes run simultaneously and cooperating. Rexygen doesnt;
• I maked free clear installation Raspberry OS 10, set up it and upgraded, then want to first install Rexygen - fail. And this is done only 1% future work!
  Error on the picture
  
  second one
  

I tried to install Raspberry Pi runtime that ways:

1. Add REXYGEN public key:
   wget -nc https://download.rexcontrols.com/files/key/rex-debian-key.pub
   sudo apt-key add rex-debian-key.pub
2. For plain Raspberry Pi, run the following commands:
   wget -nc https://download.rexcontrols.com/scripts/rex-install-rpi.sh
   chmod +x rex-install-rpi.sh
   sudo ./rex-install-rpi.sh.

In both case result is:

Resolving download.rexcontrols.com (download.rexcontrols.com)... 217.xxx.xxx.xxx
Connecting to download.rexcontrols.com (download.rexcontrols.com)|217.xxx.xxx.xxx|:xxx... connected.
ERROR: The certificate of ‘download.rexcontrols.com’ is not trusted.
ERROR: The certificate of ‘download.rexcontrols.com’ has expired.

What happend with certificate? What to do?
Thanks for your help.