OK, third time is the charm. I finally got the command right.
Everything went just fine.:
sudo dnf --releasever=37 --setopt=module_platform_id=platform:f37
--enablerepo=updates-testing $(rpm -q fedora-repos-modular >/dev/null && echo
--enablerepo=updates-testing-modular) --assumeno distro-sync
$ sudo dnf --releasever=37 --setopt=module_platform_id=platform:f37
--enablerepo=updates-testing $(rpm -q fedora-repos-modular >/dev/null && echo
--enablerepo=updates-testing-modular) --assumeno distro-sync
Copr repo for PyCharm owned by phracek 54 kB/s | 44 kB
00:00
Fedora 37 - x86_64 14 MB/s | 81 MB
00:05
Fedora 37 openh264 (From Cisco) - x86_64 2.4 kB/s | 2.5 kB
00:01
Fedora Modular 37 - x86_64 2.1 MB/s | 3.8 MB
00:01
Fedora 37 - x86_64 - Updates 333 B/s | 257 B
00:00
Fedora Modular 37 - x86_64 - Updates 313 B/s | 257 B
00:00
Fedora 37 - x86_64 - Test Updates 1.4 MB/s | 5.0 MB
00:03
Fedora Modular 37 - x86_64 - Test Updates 273 kB/s | 267 kB
00:00
google-chrome 11 kB/s | 3.6 kB
00:00
RPM Fusion for Fedora 37 - Nonfree - NVIDIA Driver 14 kB/s | 14 kB
00:01
RPM Fusion for Fedora 37 - Nonfree - Steam 3.0 kB/s | 2.2 kB
00:00
Dependencies resolved.
[...]
Transaction Summary
==================================================================================================
Install 55 Packages
Upgrade 2348 Packages
Downgrade 95 Packages
Total download size: 2.6 G
Operation aborted.