Perhaps the driver is redefined under a different name, or that specific driver was removed from the 7-26 version. Have you tried installing your printer as a "new printer" in the 7-26 version?
I'm using version 07-26 and I am unable to add a printer. My previous version 06-06 works fine. Here is the message that I get.
Unable to load the requested driver:
Unable to create the Foomatic driver [HP-LaserJet_5P,ljet4]. Either that driver does not exist, or you don't have the required permissions to perform that operation.
Perhaps the driver is redefined under a different name, or that specific driver was removed from the 7-26 version. Have you tried installing your printer as a "new printer" in the 7-26 version?
I ended up testing the CD. It fails on this computer but OK on another. I burned another CD and it works fine. Burned it at x8. The one that failed was burned at x32. Maybe it had a problem reading the CD. I didn't see any errors the first time I booted up with it.

Samsung 2.5" 870 EVO SSD SATA III 250GB 500GB 1TB Internet Solid State Drive Lot
$100.00
Western Digital Blue 3D NAND 500GB Internal 2.5" SSD - WDS500G2B0A
$49.99
Samsung 860 EVO 250GB SSD MZ-76E250 2.5" SATA III Solid State Drive -
$36.99
Intel Solid-State Drive DC S3500 Series 240GB Internal 2.5" (SSDSC2BB240G4P) SSD
$29.99
Netac 2TB 1TB 512GB 256GB Internal SSD 2.5inch SATAIII Solid State Drive lot
$549.00
Fanxiang 256GB 512GB 1TB 2TB 4TB SSD Lot 2.5'' SATA Internal Solid State Drive
$42.99
2 PACK 128 GB SSD M.2 2280 SATA Solid State Drive Major Brands, Samsung, LiteON
$28.00
Fanxiang 1/2/5/10Pcs 2.5'' SATA SSD Lot 1TB 2TB 4TB 512GB 256GB TLC Internal SSD
$129.99
Netac 120GB 256GB 1TB 2TB Internal SSD 2.5'' SATAIII 6Gb/s Solid State Drive lot
$119.99
Netac 256GB SSD 2.5'' SATA III 6Gb/s Internal Solid State Drive 500MB/s PC/Latop
$40.00