Proteus 7.2 SP 2 - Portable Edition - No install needed, no administrative rights needed, just copy all files to any drive / folder and use it. Includes: ISIS (schematics and simulation), ARES (pcb) and GERBIT (gerber files).

Note: this portabilized app is NOT compatible with Microsoft Windows 7 BETA.

Update: You can download Proteus v7.4 SP 3 Portable:

  https://www.piratebays.to/torrent/4908057/Proteus_7.4_SP3_Portable.rar