Unable to Install on UDM Pro 2.5.17

Finally got around to attempting the CLI install on my UDM Pro, but it fails. Sent debug log to team@nextdns.io, but posting here in case anyone has a helpful suggestion.

=~=~=~=~=~=~=~=~=~=~=~= PuTTY log 2023.04.26 13:50:09 =~=~=~=~=~=~=~=~=~=~=~=
[?2004hroot@udm:/# sh -c 'DEBUG=1 sh -c "$(curl -sL https://nextdns.io/install)"'~[K
[?2004l
INFO: OS: debian
INFO: GOARCH: arm64
INFO: GOOS: linux
INFO: NEXTDNS_BIN: /usr/bin/nextdns
INFO: INSTALL_RELEASE: 1.39.4
[30;1mDEBUG: Start install loop with CURRENT_RELEASE=[0m
[30;1mDEBUG: NextDNS is not installed[0m
i) Install NextDNS
e) Exit
Choice (default=i): i
INFO: Installing NextDNS...
[30;1mDEBUG: Using deb install type[0m
Reading package lists... Done
Building dependency tree
Reading state information... Done
apt-transport-https is already the newest version (1.4.11).
0 upgraded, 0 newly installed, 0 to remove and 1 not upgraded.
0% [Working]

Ign:1 http://deb.debian.org/debian stretch InRelease
0% [Waiting for headers]

Ign:2 http://security.debian.org stretch/updates InRelease
0% [Waiting for headers]

Ign:3 http://deb.debian.org/debian stretch-updates InRelease
0% [Waiting for headers]

Err:4 http://security.debian.org stretch/updates Release
  404  Not Found [IP: 151.101.42.132 80]
0% [Waiting for headers]

Ign:5 http://deb.debian.org/debian stretch-backports InRelease

0% [Working]

Err:6 http://deb.debian.org/debian stretch Release
  404  Not Found [IP: 151.101.42.132 80]
0% [Working]

Err:7 http://deb.debian.org/debian stretch-updates Release
  404  Not Found [IP: 151.101.42.132 80]
0% [Waiting for headers]

Err:8 http://deb.debian.org/debian stretch-backports Release
  404  Not Found [IP: 151.101.42.132 80]

0% [Working]

Hit:9 https://apt.artifacts.ui.com stretch InRelease
0% [Working]

Hit:10 https://apt-beta.artifacts.ui.com stretch InRelease
0% [Working]
0% [9 InRelease gpgv 16.5 kB]

Hit:11 https://apt-release-candidate.artifacts.ui.com stretch InRelease
0% [9 InRelease gpgv 16.5 kB]

Hit:12 https://repo.nextdns.io/deb stable InRelease
0% [9 InRelease gpgv 16.5 kB]

0% [Working]
0% [10 InRelease gpgv 7779 B]

0% [Working]
0% [11 InRelease gpgv 6479 B]

0% [Working]
0% [12 InRelease gpgv 8490 B]

0% [Working]

Reading package lists... Done
E: The repository 'http://security.debian.org stretch/updates Release' does no longer have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://deb.debian.org/debian stretch Release' does no longer have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://deb.debian.org/debian stretch-updates Release' does no longer have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
E: The repository 'http://deb.debian.org/debian stretch-backports Release' does no longer have a Release file.
N: Updating from such a repository can't be done securely, and is therefore disabled by default.
N: See apt-secure(8) manpage for repository creation and user configuration details.
[30;1mDEBUG: Start install loop with CURRENT_RELEASE=[0m
[30;1mDEBUG: NextDNS is not installed[0m
i) Install NextDNS
e) Exit
Choice (default=i): e
[?2004hroot@udm:/#