Hi Jeff,
New products are not getting installed in this case. Everything that is selected in New product dialog gets "installed" as a transaction, thus if one item fails, then everything is not installed. I took a look at those two specific versions of IPC and unfortunately there were some changes made in version 1.24 that make them incompatible to install. 1.24 and higher are more "correct" from what installation/discovery requires.
If you do not need IPC 1.22 and want to use MCSDK 2.00.01, then one option is to remove IPC 1.22 from CCS. You would need to go to Window->Preferences then expand "Code Composer Studio" category, then RTSC and then Products. The right hand side will show all discovered/installed products. You can then click on IPC 1.22 and then click Remove. This "de-registers" IPC 1.22, however files are still on disk, thus on next restart it will get shown in new products dialog. You would then "check" enable all products that are part of MCSDK 2.00.01.
If you do need to use IPC 1.22 and IPC 1.24, then probably the only option is to have two versions of CCS installed in different directories. One that has IPC 1.22 discovered/installed and second one that has MCSDK with IPC 1.24.
One last note: You may want to consider installing mcsdk products in non-default directory and managing product discovery paths(Tool discovery path) through that RTSC:Products preference page. Otherwise, you will keep getting that new product discovered dialog for products that are discovered but you do not want to install. CCS v5.5 does not support ability to say "I am not interested in product X, but keep discovering other new products". We are planning on making this feature available in CCSv6. The only other option is to disable auto discovery of new products and again use RTSC:Product preference page to manually trigger discovery by clicking on "Refresh".
Martin
Martin