I download the tarballs from http://geant4-data.web.cern.ch/geant4-data/releases/source/ but this link seems to be somewhat broken for some releases. For example, it works for 10.05:
$ wget http://geant4-data.web.cern.ch/geant4-data/releases/source/geant4.10.05.tar.gz
--2020-05-05 14:34:48-- http://geant4-data.web.cern.ch/geant4-data/releases/source/geant4.10.05.tar.gz
Resolving geant4-data.web.cern.ch (geant4-data.web.cern.ch)... 188.184.89.116, 2001:1458:201:e4::100:16e
Connecting to geant4-data.web.cern.ch (geant4-data.web.cern.ch)|188.184.89.116|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 36521025 (35M) [application/x-gzip]
Saving to: 'geant4.10.05.tar.gz.1'
geant4.10.05.tar.gz.1 3%[====> ] 1.13M 569KB/s ^C
but not for 10.04.p02:
$ wget http://geant4-data.web.cern.ch/geant4-data/releases/source/geant4.10.04.p02.tar.gz
--2020-05-05 14:34:57-- http://geant4-data.web.cern.ch/geant4-data/releases/source/geant4.10.04.p02.tar.gz
Resolving geant4-data.web.cern.ch (geant4-data.web.cern.ch)... 188.184.89.116, 2001:1458:201:e4::100:16e
Connecting to geant4-data.web.cern.ch (geant4-data.web.cern.ch)|188.184.89.116|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 34344696 (33M) [application/x-gzip]
Saving to: 'geant4.10.04.p02.tar.gz.1'
geant4.10.04.p02.tar.gz.1 0%[ ] 0 --.-KB/s in 14s
2020-05-05 14:35:12 (0.00 B/s) - Connection closed at byte 0. Retrying.
--2020-05-05 14:35:13-- (try: 2) http://geant4-data.web.cern.ch/geant4-data/releases/source/geant4.10.04.p02.tar.gz
Connecting to geant4-data.web.cern.ch (geant4-data.web.cern.ch)|188.184.89.116|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 34344696 (33M) [application/x-gzip]
Saving to: 'geant4.10.04.p02.tar.gz.1'
geant4.10.04.p02.tar.gz.1 0%[ ] 0 --.-KB/s in 0s
2020-05-05 14:35:13 (0.00 B/s) - Connection closed at byte 0. Retrying.
--2020-05-05 14:35:15-- (try: 3) http://geant4-data.web.cern.ch/geant4-data/releases/source/geant4.10.04.p02.tar.gz
Connecting to geant4-data.web.cern.ch (geant4-data.web.cern.ch)|188.184.89.116|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 34344696 (33M) [application/x-gzip]
Saving to: 'geant4.10.04.p02.tar.gz.1'
geant4.10.04.p02.tar.gz.1 0%[ ] 0 --.-KB/s in 0s
2020-05-05 14:35:15 (0.00 B/s) - Connection closed at byte 0. Retrying.
^C
Am I using a wrong link or is there a problem with the server? Thanks.