CandelaTech downloads broken for 18.06.8 QCA4019 ath10k-firmware?

[Daniel Bailey]

My 18.06.8 based build was working from scratch 8 days ago, but today
it is not because it appears that
https://www.candelatech.com/downloads/ath10k-4019-10-4/firmware-5-ct-full-community-11.bin-lede.001
is no longer viable. The file downloaded is all zeroes. Building from
another machine where I already have a populated openwrt-dl folder
works without issue.

The mirrors don't have the file either, though they have a similarly
named version (QCA4019-firmware-5-ct-full-community-11.bin-lede.001)
which has the correct hash. e.g.,
https://sources.openwrt.org/QCA4019-firmware-5-ct-full-community-11.bin-lede.001.

Is this just a brief hiccup on the part of Candela Technologies? If
so, what is the best course of action to get them to restore the file?

If not, what is a good way to proceed? Should I patch my
package/firmware/ath10k-firmware/Makefile to change the file name so
that it is picked up from one of the mirrors?

>From my 18.06.8 build folder:

$ ./scripts/download.pl /tmp
"QCA4019-firmware-5-ct-full-community-11.bin-lede.001"
"3daa439104806b1796c90e65bcafb18164358f0bd9e4d444302f7caf1c220dad"
"firmware-5-ct-full-community-11.bin-lede.001"
"https://www.candelatech.com/downloads/ath10k-4019-10-4"
+ curl -f --connect-timeout 20 --retry 5 --location --insecure
https://www.candelatech.com/downloads/ath10k-4019-10-4/firmware-5-ct-full-community-11.bin-lede.001
 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                Dload  Upload   Total   Spent    Left  Speed
100  505k  100  505k    0     0   435k      0  0:00:01  0:00:01 --:--:--  435k
Hash of the downloaded file does not match (file:
7cbe43a33899eaa730e15e9c3ee811c85eee19e9ed7d81a2fe73412b5b156da2,
requested: 3daa439104806b1796c90e65bcafb18164358f0bd9e4d444302f7caf1c220dad)
- deleting downloa
d.
+ curl -f --connect-timeout 20 --retry 5 --location --insecure
https://sources.openwrt.org/firmware-5-ct-full-community-11.bin-lede.001
 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                Dload  Upload   Total   Spent    Left  Speed
 0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 404 Not Found
Download failed.
+ curl -f --connect-timeout 20 --retry 5 --location --insecure
https://sources.lede-project.org/firmware-5-ct-full-community-11.bin-lede.001
 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                Dload  Upload   Total   Spent    Left  Speed
100   185  100   185    0     0    382      0 --:--:-- --:--:-- --:--:--   382
 0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 404 Not Found
Download failed.
+ curl -f --connect-timeout 20 --retry 5 --location --insecure
https://mirror2.openwrt.org/sources/firmware-5-ct-full-community-11.bin-lede.001
 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                Dload  Upload   Total   Spent    Left  Speed
 0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (22) The requested URL returned error: 404 Not Found
Download failed.
+ curl -f --connect-timeout 20 --retry 5 --location --insecure
https://downloads.openwrt.org/sources/firmware-5-ct-full-community-11.bin-lede.001
 % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                Dload  Upload   Total   Spent    Left  Speed
100   185  100   185    0     0    365      0 --:--:-- --:--:-- --:--:--   364
 0     0    0     0    0     0      0      0 --:--:--  0:00:01 --:--:--     0
curl: (22) The requested URL returned error: 404 Not Found
Download failed.
No more mirrors to try - giving up.

Best,

Daniel