Can't archive Gmail

Hi, I’ve used MailStore before on my old laptop, to archive my gmail accounts. I have a new laptop now so I downloaded mailstore and authorized access to my gmail account but when I try to start the archive I get the error message

… before starting I went into my google account and “allowed less secure apps” as I’ve had to do that before.
The error detail is:
14:56:41.880 [65] INFO: Worker started.
14:56:41.885 [65] INFO: Notify:SetTitle ‘john********@gmail.com
14:56:41.885 [65] INFO: Notify:WriteLine ‘Initializing…’
14:56:41.885 [65] INFO: Initializing…
14:56:41.898 [65] INFO: Connecting to imap.gmail.com:993, protocol: IMAP-SSL
14:56:41.967 [65] EXCEPTION: Worker has thrown an exception.
Rebex.Net.TlsException: Unable to perform revocation check of the server certificate.
at Rebex.Net.Imap.TryUpgrade(TlsParameters parameters, Boolean failOnClosed)
at Rebex.Net.Imap.ConnectSync(String serverName, Int32 serverPort, TlsParameters parameters, SslMode security)
at Rebex.Net.Imap.ConnectInternal(String serverName, Int32 serverPort, TlsParameters parameters, SslMode security)
at #UAb.#1rg.#Trg()
at #UAb.#1rg…ctor(String serverName, Int32 port, String protocol, Int32 timeout, ICertificateVerifier certificateVerifier, #29g authentication, #tG connectionDebugLog, #8lg connectionMonitor)
at MailStore.Connectors.Mailboxes.ImapMailbox…ctor(String serverName, Int32 port, String protocol, Int32 timeout, ICertificateVerifier certificateVerifier, #eah mailboxType, #29g authentication, Boolean writeConnectionDebugLog, #8lg connectionMonitor, #Lpg mailboxCache)
at #UAb.#hHb.#dHb(#SEb #cXb)
at #UAb.#hHb.#1Gb(#SEb #cXb)
at #I9g.#W9g.#zAb(Boolean #y3f)
at #Xzb.#DAb.#BAb()
at #Xzb.#sNb.#pz()
at #gib.#fib.#4hb()

*** Inner Exception ***
Rebex.Net.TlsException: Unable to perform revocation check of the server certificate.
   at Rebex.Net.TlsBase.Process()
   at Rebex.Net.TlsBase.Negotiate()
   at Rebex.Net.TlsSocket.Negotiate()
   at Rebex.Net.ImapSocket.Upgrade(TlsParameters parameters)
   at Rebex.Net.Imap.TryUpgrade(TlsParameters parameters, Boolean failOnClosed)

*** Inner Exception ***
Rebex.Net.TlsException: Unable to perform revocation check of the server certificate.
   at Rebex.Net.TlsHandshake.VerifyCertificate(String commonName, CertificateChain certificate)
   at Rebex.Net.TlsHandshake.OnHandshakeReceivedClient(Byte[] buffer, Int32 offset, Int32 count, Handshake h)
   at Rebex.Net.TlsHandshake.OnHandshakeReceived(Byte[] buffer, Int32 offset, Int32 count)
   at Rebex.Net.TlsBase.ProcessHandshake(Byte[] buffer, Int32 offset, Int32 length)
   at Rebex.Net.TlsBase.Process()

Hope you can help
Thanks