Bug 1188963

Tl;dr Could you please update the hplip version, I propose to 3.21.4.  It seems like the Leap 15.3 hplip version 3.20.11 has an hp-setup used picks a bad hp-plugin version, also 3.20.11, which does not have the correct checksum for the plugin I need. I had downgraded to OpenSuse 15.2 and did Zypper up and installed the driver. I then reinstalled 15.3, did a zypper up and then added the repository https://download.opensuse.org/repositories/home:/Sauerland:/sane/openSUSE_Leap_15.3/ which had had a hplip version 3.21.4, and was able to get my scanner operational.

The Yast2 interface has been invaluable in the past, and I've had issues with setting up my HP ColorJet MFP 477fnw, hp-setup runs as expected and the printer works, but the hp-plugins program is needed to configure scanner access.  In particular
1) I go to the printer configuration manager via yast and then select Run hp-setup
2) The printer and the corresponding fax are correctly setup, click on OK and finished.
3) When I go to the scanner page I see the scanner as detected, but when I select the button to pulldown other->Test, I get a pop-up error saying:

Test with 'scanimage -d hpaio:/net/HP_Color_LaserJet_MFP_M477fnw?ip=192.168.1.254 -v' failed.
The results are:

Output format is not set, using pnm as a default.
scanimage: open of device hpaio:/net/HP_Color_LaserJet_MFP_M477fnw?ip=192.168.1.254 failed: Error during device I/O

4) But the hp-plugin was activated, but the ui window is not displayed.  On the
Driver-Plugin Installation is Required window, click on Next,
5)A Driver Plugin Installation window pops up, take the default "Download and install from an HP authorized server (Recommended), and click Next.
5) Get popup saying /home/foolishewe/.hplip/hplip-3.20.11-plugin.run file does not match its checksum. File may have been corrupted or altered, only choice is to click OK (but it really is not OK).
6) Get a popup window that says Failed to install Plug-in.
Either you have chosen to skip the Plug-in installation  or entered incorrect Password, only choice is OK again.
7) Get Error Failed to test hpaio popup.

XSane also complains and also launches hp-plugin before failing.
hp-plugin --version reports:
error: /root/.hplip/hplip-3.20.11-plugin.run file does not match its checksum. File may have been corrupted or altered
foolishewe@localhost:~/testdir> hp-plugin --version

HP Linux Imaging and Printing System (ver. 3.20.11)
Plugin Download and Install Utility ver. 2.1


foolishewe@localhost:~/testdir> hp-setup --version

HP Linux Imaging and Printing System (ver. 3.20.11)
Printer/Fax Setup Utility ver. 9.0