Recover Thunderbird email using old profile; current profile was lost.

I had to reformat a hard drive. Unfortunately, my current Thunderbird profile was erased. I have a 7-month earlier profile backed up, and my current emails are still available from Spectrum webmail. Can I re-install the old profile, and download the newer emails from Spectrum to create a new profile? What is the safest way to proceed and not lose emails? Thanks!