Old imac on 10:10:5 - cannot use command line and cannot run `keybase log send`

I have a very old imac from 2007 and my ability to update the mac os from 10.10.5 is limited.
I have installed keybase and the client gui works.
I cannot use the command line so and I cannot run `keybase log send` as it fails and I get the message below when I boot.

I have been able to manually install osxfuse.
**Could I have the manual commands for setting up the keybase fs mount on macos so that I can use the command line.**

Thanks

---------------------------- on reboot on imac -----------------------------------
Keybase Install error
We were unable to load KBFS (Fuse kext). This may be due to a limitation in MacOS where there aren't any device slots available. Device slots can be taken up by apps such as VMWare, VirtualBox, anti-virus programs, VPN programs and Intel HAXM.

Please run `keybase log send` to report the error.

Start with the reported `keybase log send` failure and the KBFS (Fuse kext) install error on macOS 10.10.5; review the manually installed osxfuse and requested mount setup. Done means documenting verified commands that enable the client to mount KBFS and use the command line, or confirming that this OS cannot support it.

Written by the indexing model from the issue text.