It might depend on the version(s) you are trying to download. It would be best to contact Support if it is the 2023 download, but problems with previous versions have been reported and Ramon (one of the developers) made some files available from a separate URL.

communityhub.sage.com/.../481971

Yes, it is the 2023 version. I was able to download Sage 500 ERP Documentation 2023 shown in list below but the other downloads result in the error. 

Thanks!

If your support agreement with Sage is up to date, then you would need to contact them about the download. If it isn't, you won't be able to update because the database product licensing will disallow the upgrade. Overall, the upgrade might be difficult from 7.4 to 2023 (version 8.2). This is primarily because there is no direct path from a version that old to the newest. It can be done, it just requires some additional knowledge of the upgrade process, some of the upgrade utilities between those versions, platform and SQL engine upgrades and some extra time. The more functionality you have implemented, the more time it will take to work out the extra "features" and upgrade methodology.

If your support agreement with Sage is up to date, then you would need to contact them about the download. If it isn't, you won't be able to update because the database product licensing will disallow the upgrade. Overall, the upgrade might be difficult from 7.4 to 2023 (version 8.2). This is primarily because there is no direct path from a version that old to the newest. It can be done, it just requires some additional knowledge of the upgrade process, some of the upgrade utilities between those versions, platform and SQL engine upgrades and some extra time. The more functionality you have implemented, the more time it will take to work out the extra "features" and upgrade methodology.

Thanks for your assistance!