Extensions fail to install properly on Google Chrome Portable 8.0.552.215. This appears to be an unresolved issue from Google Chrome Portable 7.0.517.44.
For example, when attempting to install Adblock, I got the following error:
"Could not create directory for unzipping E:\PortableApps\GoogleChromePortable\Data\PROFILE\Temp\scoped_dir_25818\CRX_INSTALL"
I"m running Windows XP SP3 without Chrome installed on the PC itself.
This is pretty much a deal-breaker for me. As others have noted, previous versions of GoogleChromePortable managed extensions flawlessly for me.