I just happened upon the update article concerning AgileBits 1Password update to 7.8.7
In the blurb it is mentioned, if I understood properly a Stand Alone License is still available.
As of 15 June 2021 AgileBits no longer sells Stand Alone Licenses.
Please see this update via 1Password forum from one of the creators, Dave of 1Password.
Once opened, please scroll down slightly past the gentleman, @soshiito who posed an excellent query and Dave responded.
I hope this helps.