Win 10 w/all updates, Thunderbird 128.3.2esr (32-bit) Messages from gMail can no longer be downloaded to Thunderbird?

Without some information like the error message or messages you see, you are really asking folks to guess.

Most usually trouble with connectivity to google comes from three sources.

1. Wrong authentication method. It must be oAuth. See https://support.mozilla.org/en-US/kb/automatic-conversion-google-mail-accounts-oauth20
2. Antivirus program that is blocking mail through it's scanner or occasionally post update it's software firewall.
3. Systerm optimization software that deletes Thunderbird settings files as unnecessary.