I still have the same problem. Have Bootstrap 4 installed on Ubuntu 20.04.
When I try to start it using terminal, get the following:
/opt/bootstrapstudio$ ./Bootstrap\ Studio
Pango-ERROR **: ##### Harfbuzz version too old (1.4.2)
My Harfbuzz is 2.6.4.
Can't download Bootstrap Studio from the website, where do I get the latest version?