The last release to target 2.0 .NET was mojoPortal 2.2.7.9. As of 2.2.8.0, we are targeting .NET 3.5. If you still need a 2.0 build it may be possible to make your own build with the source code by changing the target back to 2.0 and removing any files that give compile errors. Or you can download 2.2.7.9. Ideally you or your host should install .NET 3.5 sp1.
I asked the community about moving to 3.5 when I released 2.2.7.8, and mostly people said yes lets move forward, so we did.
I also mentioned in the 2.2.7.9 release that it was the last one that would target 2.0 .NET.
Best,
Joe