Yes, you can. The 1.8 versions are still on the openLCA server: http://www.openlca.org/wp-content/uploads/2019/02/
The databases should be compatible between both versions so that it should be possible to use the same database with openLCA 1.8 and 1.9.
Could you also provide more information about these errors so that we can fix them in future versions:
Thanks!