If there were any .PAR or .PAR2 files included with the RAR archive then the missing part can be recreated using SmartPar or QuickPar respectively but without these PARity files I believe you are stuck. click here for more info on Rar and Par files.
OnePlus 5 review
Alice Saey's mesmerising animation for Dutch singer Mark Lotterman
iPad Pro 10.5in (2017) review
Comment booster votre iPhone ?