I installed the main game and the zero hour. All menu items were playable in solo mode.
I installed ROTR 1.85 and then the 1.86 patch and the USA, GLA, china and challenges are inactive and unselectable.
I installed the latest patch (1.87) the problem goes on.
The skirmish mode functions properly.
Is the ROTR mod supposed to have no campaign or challenges mode? or it's just me having the problem?
I searched for others with the same problem and found no one.
Any help will be greatly appreciated since I'm fed up playing the skirmish mode.
Following there is the screenshot for the problem.

RotR is yet to reach its final version, so the campaign and the challenges are not available at the moment. However, if you want to play some really good fan-made missions and challenges, you can find them here.

Thank you.
Actually I thought of ROTR as SHOCKWAVE which hosted those items, since both are projects of the same group.
Anyway, great job and thanks for the link.

You're welcome. Well, great job indeed. Just not my job. 😂 Most of those maps were created by really great team and forum members who started the topics.