I got this output:
$ LC_ALL=C sudo dnf system-upgrade download --releasever=43
Updating and loading repositories:
Repositories loaded.
Failed to resolve the transaction:
Package "rpmfusion-nonfree-release-42-1.noarch" is already installed.
Package "rpmfusion-free-release-42-1.noarch" is already installed.
Package "qcom-wwan-firmware-20251021-1.fc42.noarch" is already installed.
Problem 1: wine-dxvk-2.6.2-1.fc42.i686 from @System has inferior architecture
- wine-dxvk-2.6.2-1.fc42.x86_64 does not belong to a distupgrade repository
- problem with installed package
Problem 2: wine-dxvk-d3d10-2.6.2-1.fc42.i686 from @System has inferior architecture
- wine-dxvk-d3d10-2.6.2-1.fc42.x86_64 does not belong to a distupgrade repository
- problem with installed package
Problem 3: wine-dxvk-d3d8-2.6.2-1.fc42.i686 from @System has inferior architecture
- wine-dxvk-d3d8-2.6.2-1.fc42.x86_64 does not belong to a distupgrade repository
- problem with installed package
Problem 4: wine-dxvk-d3d9-2.6.2-1.fc42.i686 from @System has inferior architecture
- wine-dxvk-d3d9-2.6.2-1.fc42.x86_64 does not belong to a distupgrade repository
- problem with installed package
Problem 5: wine-dxvk-dxgi-2.6.2-1.fc42.i686 from @System has inferior architecture
- wine-dxvk-dxgi-2.6.2-1.fc42.x86_64 does not belong to a distupgrade repository
- problem with installed package
I also needed to disable VirtualBox repo, because of 404 errors:
Fedora 43 - x86_64 - VirtualBox 100% | 11.6 KiB/s | 27.6 KiB | 00m02s
>>> Status code: 404 for http://download.virtualbox.org/virtualbox/rpm/fedora/43/x86_64/repodata/repomd.xml (IP: 9
>>> Status code: 404 for http://download.virtualbox.org/virtualbox/rpm/fedora/43/x86_64/repodata/repomd.xml (IP: 9
>>> Status code: 404 for http://download.virtualbox.org/virtualbox/rpm/fedora/43/x86_64/repodata/repomd.xml (IP: 9
>>> Status code: 404 for http://download.virtualbox.org/virtualbox/rpm/fedora/43/x86_64/repodata/repomd.xml (IP: 9
>>> Usable URL not found