Interestingly, Apple changed its stance on older software in recent years. You can now download the official directly from Apple’s support website for free. This official version provides the safest foundation, which can then be converted into a bootable ISO using standard disk utility tools.
The 10.7.5 update was the final stable release for Lion, introducing several refinements and security patches: mac os x lion 107 5 iso download repack link
Selecting the "Download" button on that page will provide a file named Mac_OS_X_Lion_Installer.dmg (approx. 4.72 GB). Interestingly, Apple changed its stance on older software