Use UrBackup client on a Raspberry Pi 5

I want to use the UrBackup client on a Raspberry Pi 5.
On the Raspberry Pi, there is Raspberry Pi OS (64-bit normal from 1st October 2025) installed.

Since the normal command does not work:
TF=$(mktemp) && wget “https://hndl.urbackup.org/Client/2.5.26/UrBackup%20Client%20Linux%202.5.26.sh” -O $TF && sudo sh $TF; rm -f $TF
“Error running executable on this system (aarch64). Stopping installation”

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I followed the instructions:

I had to install the libwxgtk3.2-dev package instead of libwxgtk3.0-dev and also libdevmapper-dev so that the installation worked. The UrBackup client from the Raspberry Pi is also displayed on the server.

Since rc.local is outdated, I created a service with systemd.
sudo nano /etc/systemd/system/urbackup.service

		[Unit]
		Description=UrBackupClientBackend
		After=network.target

		[Service]
		Type=simple
		ExecStart=/usr/local/sbin/urbackupclientbackend -d
		
		[Install]
		WantedBy=multi-user.target

I reloaded the daemon, enabled the service, and started it.
Unfortunately, it won’t start. The server shows the client as offline.

When I enter the command “sudo urbackupclientbackend -v info”, I get first the result that the server cannot be found. Shortly after this, the server is found, and the file backup works as intended (but only after I entered this command). [The image backup doesn’t work, but I don’t need this.]

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Does anyone have any idea what could cause this?
Or does anyone have better instructions or comments on how to install the UrBackup client on a Raspberry Pi?

Many thanks in advance.