The present invention relates to a system (100) to download and convert a virtual appliance (101) in a cloud computing system. The system comprising a virtual appliance manager (103). The virtual appliance manager (103) further comprising a downloader (104) configured for downloading a virtual appliance (101) from a target host in form of blocks, a converter (105) configured for converting the virtual appliance (101), a merger (106) configured for merging all the converted blocks of the downloaded virtual appliance (101) upon completion of the download and conversion processes and a registrar (107) configured for performing a post conversion process after all blocks of a virtual appliance (101) been merged. The virtual appliance manager (103) downloading and converting the virtual appliance (101) concurrently wherein the converter (105) converting the virtual appliance (101) if requested format is different from the virtual appliance available format.