Adobe Premiere Pro CS4 Third Party Content

I installed Premiere Pro CS4 as a trial version first. After I licensed it, it showed a window saying "Additional codecs that are not included in the trial version of Premiere Pro CS4 must be installed." And when I click "OK", it starts and downloads a bit of it, however, halfway through it stops and another window pops up saying only "Installation was unsuccessful." and the rest is just offering me to contact Adobe Support.

Even though I pay it no mind and try to continue my project, the same window pops up every 2-3 minutes. I can't continue my work. Is there a solution? ! !