Third-party archives like Software Informer also list version 2.43.
: Optimized for lower bandwidth using high-quality codecs like G.729 and H.264 (available in Biz/Premium editions). Setup Guide for New Users Need a download link for Zoiper version 2.43 i--- Zoiper Classic 2.43 Download
The operational logic of Zoiper Classic 2.43 followed a standard softphone configuration hierarchy: i--- Zoiper Classic 2.43 Download