Access to v21.5.9.201 download service pack

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Hi! I need to re-install an old sage version on a network pc, other machines on the network are running version 21.5.9.201 I have installed v21, but it is a slightly lower version and wont auto check for updates as i believe they have been turned off for old versions now.

I have tried looking for it on the sage website, but it insists the serial number isnt registered (it is, but maybe is too old to show). I believe i need service pack 8? where can i download it from please?

thanks!