Base extracts to %SystemDrive% not to 'C:'
- Yes it works on ANY drive letter
If you are installing to a second partition then you need to make sure you have enough space on %systemdrive%
(SystemDrive may or may not be the destination drive letter...)
Can you at least tell us how far into the install you are when this message appears?
Your details are incomplete and unclear regarding the specifics of the error...
(thanks for including your log that answers TONs of questions for us)
furthermore "there is nothing to extract" is not a DriverPacks BASE or 7zip error...
I suggest you try it without DriverPacks to the second partition.
I believe you will find it is related to a svcpack you have added with nLite or other program.
In which case i am looking forward to your apology for your attitude.
and no... this version was released well over a month ago to the testing team...
hundreds of people were testing it for a month before it was even a RC version.
- you are just not on the testing team nor are you able to see that forum.
re: "Please don't tell me that people have been using this DPBase for months with no reported issues."
We get 32,000 downloads a day... so we had 100 people using it about 5 minutes after i announced it.
- you're right, 100 users is way off...
There is probably more like 250,000 (Two hundred and Fifty thousand) users since it has been a week... 
When an issue is only reported by one person out of hundreds of thousands...
And the testing team had been trying to break it for many weeks before the release...
And the error message does not exist in our code... nor in our extractors code (7zip)...
What would you say?