Kemira's art collection, I deduplicated them manually and removed some SFW ones, then renamed and sorted them in reverse time order (newest-oldest).
The latest Real-ESRGAN image restoration model was used to upscale (4.0x, as the training model was designed for) and restore (denoise, remove JPEG artifacts) the image.
The Real-ESRGAN took about 3 hours to crunch down all 170+ images on my machine.
All uploaded pics were compressed with lossless PNG format, in compression level 9.
Mega Link: https://mega.nz/file/gJgUEJBT#y-PgBmy3IGh3npEswY9bf5T08fcHsRExBXOi4OwQMB0
Feel free to re-upload the whole archive elsewhere then share the link, since I'm not sure how long it would stay up in my cloud drive.
Pictures in the archive were compressed using WebP in lossless mode for maximum disk space utilization (nearly 40% reduction compare to PNG with no information loss).
You can use many free image converters to convert them into any file types you like with no quality degradation, I personally like to use XnConvert.
You can also look at them as is, using image viewers like ImageGlass and XnView.