You cannot be maximally safe when using ShadowDefender in this way. If you are infected while being in Shadow Mode then after reboot the malware will be wiped out from the protected disks. But, your system could be compromised anyway if the malware called home and transferred personal data:
- Passwords used in web browsers.
- User and Admin credentials.
- Personal files.
- Information about the system, local network, installed applications, etc.
Furthermore, other devices in your home network could be compromised too, for example:
- Network drives.
- Other computers.
So, you have to use an offline application installer and disconnect your computer from the local network (not only from the Internet).
If the file from OP was downloaded from the developer website
(imusic-win_setup_full2400.exe ) then it is safe. It is an application downloader:
VirusTotal
This downloader downloads and executes the offline installer
imusic-win_full2400.exe:
VirusTotal