sysupgrade failures

I tried to 'sysupgrade' this box and a laptop several times yesterday.
All attempts to do so failed.

Attempts to 'sysupgrade' from:

https://mirror.fsmg.org.nz/

failed with the mirror informing me that it must receive such requests
as https, not http. (I did not note the exact wording at the time
sorry.) 404 and 300 were also mentioned.

Attempts to 'sysupgrade' from:

https://mirror.aarnet.edu.au/

failed due to segmentation faults. The output below was captured after
more than one upgrade attempt, some of which included the '-k' switch.

wrcr4:~$ doas /usr/sbin/sysupgrade -s
Fetching from https://mirror.aarnet.edu.au/pub/OpenBSD/snapshots/amd64/
SHA256.sig 100% |*********************************************************************************************************************| 2144 00:00
Segmentation fault

wrcr4:~$ doas /usr/sbin/sysupgrade -s
Fetching from https://mirror.aarnet.edu.au/pub/OpenBSD/snapshots/amd64/
SHA256.sig 100% |*********************************************************************************************************************| 2144 00:00
Signature Verified
BUILDINFO 100% |*********************************************************************************************************************| 54 00:00
Verifying old sets.
comp78.tgz 100% |*********************************************************************************************************************| 88880 KB 00:07
Segmentation fault

wrcr4:~$ ls -l /home/_sysupgrade
total 1338536
-rw-r--r-- 1 root wheel 54 Mar 10 10:21 BUILDINFO
-rw-r--r-- 1 root wheel 44889 Mar 10 10:21 INSTALL.amd64
-rw-r--r-- 1 root wheel 1992 Mar 10 16:32 SHA256
-rw-r--r-- 1 root wheel 524285892 Mar 10 10:17 base78.tgz
-rw-r--r-- 1 root wheel 32291109 Mar 10 15:06 bsd
-rw-r--r-- 1 root wheel 32480442 Mar 10 10:16 bsd.mp
-rw-r--r-- 1 root wheel 4841424 Mar 10 15:12 bsd.rd
-rw-r--r-- 1 root wheel 91013740 Mar 10 16:32 comp78.tgz

wrcr4:~$ cat /home/_sysupgrade/BUILDINFO
Build date: 1773091316 - Mon Mar 9 21:21:56 UTC 2026

wrcr4:~$ sysctl kern.version
kern.version=OpenBSD 7.8-current (GENERIC.MP) #275: Mon Mar 2 23:45:40 MST 2026
deraadt@amd64.openbsd.org:/usr/src/sys/arch/amd64/compile/GENERIC.MP

Would the above be due to changes in base that are not yet complete?
TIA for your replies.

--
aer