Steps:
1. Make a .zip file
Select all images of the GTR47mm watch (ONLY PNG!) and pack these images to a .zip file with programs like winzip, winrar etc). Save this file and make sure the name has no spaces.
2. Upload the file
Upload the.zip file by clicking "upload".
3. Press button "Convert to 42mm"
4. Download the converted zip file
Download the converted zipfile by pressing: "Забрать готовый архив". Now the images in this new zip files are converted to 42mm size!