You can install and run svBuilder alongside svBuilder-Pro on the same computer so, ordinarily, it should not be necessary to uninstall svBuilder before installing svBuilder-Pro.
If you were able to extract the zip file without any errors, then it is unlikely that the 'svBuilder-Pro.air' installation file is corrupt.
If you want to check that the file is OK, then it should have the following properties:
Filesize: 1,467,606 bytes
You can check the MD5 and/or SHA1 hashes with a program such as HashCalc (free) or HashTab (free for personal use).
If your file does not have the properties listed above, then try downloading the zip file again using a different browser.
If your file does have the properties listed above, then I would try completely uninstalling Adobe AIR and svBuilder-Pro and then reinstalling both applications.
You can download the most recent version of Adobe AIR from here.
Try the procedure in this forum thread.
(Uninstall and then reinstall Adobe AIR between steps 4 and 5).
There are also additional tips in this forum thread which might help.
SimpleViewer Support Team