Hi Guyser, thank you for taking the time to evaluate Proxy Multiply! I would strongly recommend disabling your limit of 4,500 proxies. You are severely restricting the amount of proxies you can find by doing that. 45,000 is perhaps a limit to consider, but expecting to scrape any old 4,500 proxies and find large numbers of working proxies is unrealistic. Try disabling the limit entirely and seeing if that resolves your issues. Google enabled proxies are the rarest form of all, so you shouldn't expect more than ~100 working verified Google proxies from a 100,000 or so size list (the default scrape list will yield about 100k if you also have the option "Configure->General->When crawling a website, also crawl links on that page" enabled). You can expedite proxy testing by disabling SOCKS proxy testing if it is enabled, and by increasing your number of threads (Configure->General).
There is no trial period of Add-Ons available. We offer no guarantee of proxies, but we have many satisfied customers. They tend to post here every couple weeks or so.

The key thing to remember is that Proxy Multiply doesn't just leech from lists of proxies in text files - it consults numerous dynamic, constantly updated websites that provide working proxies. Furthermore, it then searches Google/meta-search-engines using your proxy list as a search basis to find more proxies.