MY RESULTS:
md5sum devuan_ascii_2.1_amd64_dvd-1.iso              AEFA3DC1461FD0A7792E27ABD171C27A  (ORIGINAL ISO)
head -c 4675600384 /dev/sdf1 | md5sum                  904a76b91eded9993b7b37f186227ff - (FLASH DRIVE)

I have managed to install after a second attempt devuan ascii, how ever my mda5sum / sha256sum check showed a discrepancy on the contents (from image) loaded to my flash drive, yet i managed to install ascii.
As ralph.ronnquist mentioned on 2019-11-18 23:29:06 that isolinux/isolinux.bin is left out because its md5sum count changes after installing on flash drive.
I am wondering if it applies the same to the rest of the files. ???
I ask this question since I had many problems with installing devuan jessie and getting it to work, until i did a sha256sum check on my downloaded file and found it corrupt. I re-downloaded the devuan_jessie_1.0.0_amd64_CD.iso file, sha256sum checked out, and re-installed. A number of the problems vanished including trying to get hplip to see my scanner (via hp-setup). So the same could be said for ascii.

How ever Altoid makes a very compelling argument on 2019-11-20 22:00:50 alluding to the fact that corruption can also occur in writing to flash drive. As can be seen by my results above my image seems a problem yet my installation went fine after second attempt.

fsmithred mentioned on 2019-11-19 15:03:35 a valid point: which i personally have experienced on both jessie and ascii and that is for whatever reason the installing of software and even boot loader (grub2) fails, on re-trying 'it came right'. Not a very stable installation though. I don't recall having this on ubuntu or linux mint, or puppy, knoppix etc! Not sure if it is due to large amounts of data needing to be downloaded to complete the installation, yet i expected devuan_ascii_2.1_amd64_dvd-1.iso to be a far more easier installation in this regard, since it did not require much download to complete the installation. Most files were in the iso. Yet it too was a problem.

IN CONCLUSION
So far my installed ascii does not show any signs of corruption. I installed a couple of programs that i use and they all went fine. I even installed my hp scanner the quickest way i found, by using hp-setup -i in command line.
I think it will be safe to say that if the flash drive being used is in question buy another one (good make), sha256sum check the downloaded iso with the sha256 values provided by devuan and write to flash as normal.
During installation: Make sure apt package manager is updated correctly, retry if having trouble. Retry any software failures and or bootloader install failures.
This is about the best advice i can give.
Devuan iso's have brilliant partitioning utility in their installer but the installation with setup has been the most difficult out of any linux so far. I entertain all the nonsense because i want to boot up with initd NOT systemd! I found devuan very fast on an old Intel Core 2 duo core E7500 PC, 4 Gb ram. 

Hi Rolfie

I managed to successfully install libusb-1.0-0_1.0.19-1_amd64.deb, It was in the Downloads folder > cd Downloads > dpkg -i libusb-1.0-0_1.0.19-1_amd64.deb. Sorry I have been over 6 hrs at this..
BUT I still have no success with hplip.