If you have access to an older version of Illustrator or a backup, you can manually copy the .acb library files into your current version to bypass the subscription.
: Copy the .acb files (like PANTONE+ Solid Coated.acb ) and paste them into the same directory within your current Illustrator version's application folder. download pantone colors for illustrator
Applications/Adobe Illustrator [Version]/Presets/[Language]/Swatches/Color Books If you have access to an older version