You cannot install and run multiple versions of office simultaneously.Unlike the web-based installer, there are certain limitations to the offline installer: If you’re going to install add-ons, Microsoft recommends the 32-bit version for compatibility reasons. The 32-bit version installer has a file size of 624.52 MB, and the 64-bit version is of 702.91 MB. Like the web-based installer, offline installer is also available in both 32-bit and 64-bit versions. The Home Premium edition was immediately made available for user testing, however, it was an online installer. If you’d rather prefer an offline installer, you can now get the standalone installer from Microsoft TechNet. Yesterday Microsoft CEO Steve Ballmer unveiled the next generation of Microsoft Office: Office 2013.
