Many Macs running 10.7.5 can be upgraded to OS X 10.11 (El Capitan) or macOS 10.12 (Sierra) for free.
If the proves too unstable, consider these modern alternatives that still actively support Lion:
Many Macs running 10.7.5 can be upgraded to OS X 10.11 (El Capitan) or macOS 10.12 (Sierra) for free.
If the proves too unstable, consider these modern alternatives that still actively support Lion: google chrome free download for mac os x 10.7.5