Hi @Andrew Wilson2 ,
We could rename the 1033 folder which located SMS_CCM to check if the issue could be solved.
Here is the similar post about unabling to install bgbisapi.msi due to not enough available disk space:
https://social.technet.microsoft.com/Forums/en-US/9168751a-b80b-4434-9876-c83f9a291a0e/unable-to-install-bgbisapimsi-due-to-there-is-not-enough-available-disk-space-on-to-complete-this?forum=configmanagergeneral
If it does not work, it is recommended that we could call Professional Support Services so that a dedicate engineer will help you solve this issue in a more efficient way.
To obtain the phone numbers for specific technology request please take a look at the web site listed below:
https://support.microsoft.com/en-us/topic/global-customer-service-phone-numbers-c0389ade-5640-e588-8b0e-28de8afeb3f2
Thank you for your understanding and have a nice day!
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