When using Alfred 4 some of the workflows stopped working because, in the workflows, a reference was made to the workflow data in the Alfred 3 folder. I used this symlink as a "dirty" way to "fix" this.
~/Library/Application Support/Alfred 3# ln -s ~/Library/Application\ Support/Alfred/Workflow\ Data/ .
~/Library/Application Support/Alfred 3# ls -ln
total 16
drwxr-xr-x 5 639061583 1987437277 160 Jun 3 2018 Alfred.alfredpreferences
drwxr-xr-x 9 639061583 1987437277 288 May 30 19:02 Databases
drwxr-xr-x 3 639061583 1987437277 96 May 25 2018 Plugins
lrwxr-xr-x 1 63906158