Hi, OpenRCT2 dev here.
FYI: OpenRCT2 has support to consume RCT Classic assets as its base. Also, RCT Classic is available on Steam too (Windows and macOS only, though).
FYI: OpenRCT2 has support to consume RCT Classic assets as its base. Also, RCT Classic is available on Steam too (Windows and macOS only, though).
Partially hijacking your comment to say that an easy way to get the original assets in openrct 2 is to install the gog version through wine or play on Linux. Have played it a bit too much to say the least...
Not having purchased the Steam version, I don't have an opinion on it personally.