Not all Windows 95 releases are the same. If you are looking through an archive, you will likely encounter several different "OSR" (OEM Service Release) versions:
Most archives list a generic or original setup key; you will need this to finish the installation. windows 95 iso archive
Reliable archives provide MD5 or SHA-1 hashes to ensure the ISO hasn't been tampered with or corrupted during the upload. Not all Windows 95 releases are the same