Autodesk Inventor 2013 and its related service packs have reached their End of Life (EOL) and are no longer officially supported by Autodesk. The direct download links may no longer be active on the main Autodesk website. However, the files may still be available via the Autodesk FTP archives or third-party repositories (use caution with third-party sites).
http://download.autodesk.com/us/support/inventor/2013/Autodesk_Inventor_2013_SP2_32bit.exe autodesk inventor 2013 service pack 2 download
Released as a critical update for the 2013 design suite, serves as a cumulative patch designed to improve the stability and performance of Autodesk Inventor 2013 . It incorporates all previous hotfixes and Service Pack 1, making it a vital requirement for users maintaining legacy design data. Key Improvements Autodesk Inventor 2013 and its related service packs