I don't know if someone from Gog still moderates this but the link names for the Offline Backup installers have been named incorrectly for quite awhile now.

- Errata: Renowned Explorers: International Society (Part 1 of 2) ver. 522
Should read: Renowned Explorers: International Society 32-bit ver. 522
There is no Part 1

- Errata: Renowned Explorers: International Society (Part 2 of 2) ver. 522
Should read: Renowned Explorers: International Society 64-bit ver. 522
There is no Part 2

The final entry
- Renowned Explorers:International Society (32-bit) ver. 520
Should be eliminated since it leads to an older version of the 32bit version executable.