Pandoc installation failure

I am trying to install Pandoc from the arch packages.
Here’s the terminal output


Total Download Size:    52.44 MiB
Total Installed Size:  504.03 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages...
 pandoc-2.19.2-56-x86_64.pkg.tar.zst failed to download
 Total (  1/204)                                     52.4 MiB  44.4 MiB/s 00:01 [----------------------------------------------] 100%
error: failed retrieving file 'pandoc-2.19.2-56-x86_64.pkg.tar.zst' from repo.slithery.uk : The requested URL returned error: 404
error: failed retrieving file 'pandoc-2.19.2-56-x86_64.pkg.tar.zst' from archlinux.uk.mirror.allworldit.com : The requested URL returned error: 404
error: failed retrieving file 'pandoc-2.19.2-56-x86_64.pkg.tar.zst' from lon.mirror.rackspace.com : The requested URL returned error: 404
error: failed retrieving file 'pandoc-2.19.2-56-x86_64.pkg.tar.zst' from mirrors.ukfast.co.uk : The requested URL returned error: 404
error: failed retrieving file 'pandoc-2.19.2-56-x86_64.pkg.tar.zst' from mirrors.gethosted.online : The requested URL returned error: 404
error: failed retrieving file 'pandoc-2.19.2-56-x86_64.pkg.tar.zst' from mirror.cov.ukservers.com : The requested URL returned error: 404
warning: failed to retrieve some files
error: failed to commit transaction (failed to retrieve some files)
Errors occurred, no packages were upgraded.

Any advice?

Try updating your system before installing the package:

sudo pacman -Syyu

Next:

sudo pacman -S pandoc

If it still fails, launch the welcome app, refresh your mirrors and repeat the commands above.

Thanks
I get the following error

otal Download Size:      5.07 MiB
Total Installed Size:  8261.65 MiB
Net Upgrade Size:        89.56 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages...
 openssl-3.0.7-4-x86_64                               5.1 MiB  8.31 MiB/s 00:01 [----------------------------------------------] 100%
(591/591) checking keys in keyring                                              [----------------------------------------------] 100%
(591/591) checking package integrity                                            [----------------------------------------------] 100%
error: openssl: signature from "Pierre Schmitz <pierre@archlinux.org>" is marginal trust
:: File /var/cache/pacman/pkg/openssl-3.0.7-4-x86_64.pkg.tar.zst is corrupted (invalid or corrupted package (PGP signature)).
Do you want to delete it? [Y/n] 

should I say Y or n

Say Y.

Then update the keyring:

sudo pacman -Sy archlinux-keyring

and finally

sudo pacman -Syu pandoc

Now your system should be up to date.

Looks promising
Thank you