But I have not yet figured out from where to download those.
The problem is that it doesn't allow you to browse. So you kind of have to guess the filename part. The package name is fairly predictable, as it's always the same. But the exact version can change over time. That said, I can explain how to get there.
So, we take the base URL like above;
https://pkg.freebsd.org/FreeBSD:13:amd64/
The reference to 13 (major version) and AMD64 (architecture) should be fairly obvious. Adjust if necessary. The path from there will be
/quarterly/All/ for the 'quarterly' packages, then the packagename;
pkg-,
realtek-re-kmod-. The exact version is the tricky bit. It changes, if I give the exact version now that link will be dead on the next update. So you need to figure this out when you're fetching the packages.
Look up the package on
https://www.freshports.org for example
ports-mgmt/pkg. It will tell you what the package name is. Scroll down the page a bit, there will be a list of package versions. For each supported version and architecture, a version from quarterly and latest. Pick the version from the 'quarterly' column. Last is the
.pkg
extension.
Put all this together (quarterly has 1.20.9 now):
https://pkg.freebsd.org/FreeBSD:13:amd64/quarterly/All/pkg-1.20.9.pkg
Clicky link:
https://pkg.freebsd.org/FreeBSD:13:amd64/quarterly/All/pkg-1.20.9.pkg
net/realtek-re-kmod:
https://pkg.freebsd.org/FreeBSD:13:amd64/quarterly/All/realtek-re-kmod-198.00_3.pkg
https://pkg.freebsd.org/FreeBSD:13:amd64/quarterly/All/realtek-re-kmod-198.00_3.pkg
I will copy those from this computer to a USB drive, haul that to the other computer in my shop, then copy those to the shop computer and install them.
Copy them to a FAT32 formatted USB stick. You can read that on a "bare" FreeBSD install.
In case it wasn't obvious, this downloads the
package, not the
distfiles required to build the port. Building typically requires a bunch of other
build dependencies. Lots of files to download. Plus it'll take time to build it all. Just grab the packages and quickly install those. Get it online. Then you can build everything from source if you really want.