=&0=& and possibly get the decryptor from them. This is not reliable: they might not send you the decryptor at all, or it might be poorly done and fail to decrypt your files.
=&1=& that would allow you to decrypt files without paying. This turn of events is possible but not very probable: out of thousands of known ransomware variants, only dozens were found to be decryptable for free. You can visit NoMoreRansom site from time to time to see if free decryptor for GandCrab exists.
=&2=&. For example, antivirus vendor =&3=& offers its own decryption services. They are free for users of Dr.Web Security Space and some other Dr. Web’s products if Dr. Web have been installed and running at the time of encryption (more detail). For users of other antiviruses the decryption, if it’s deemed possible, will cost €150. According to Dr. Web’s statistics, the probability of them being able to restore files is roughly 10%.
Other ways to recover encrypted files:
English
Arabic
Chinese (Simplified)
Czech
Dutch
French
German
Italian
Japanese
Portuguese
Russian
Spanish