Older versions are not legally free. Power Line Systems does not offer abandonware. Only the current trial and viewer are official.
Consider used license transfer – PLS allows resale of old perpetual licenses (version 16 or older) via formal transfer fee (~$500). Check engineering forums like Eng-Tips for listings. plscadd pole saps tower top free downloa
Some authorized resellers offer short-term rentals (e.g., $300–$500/month for PLS-CADD). This is far cheaper than the $8,000+ permanent license if you only have a one-off project. Older versions are not legally free