You cannot read your G16 native raw files with any version of LR 4 so there’s no information, here, about paying to update from LR4 to LR 4.4. You need LR 5.2 to read G16 raw files natively. LR 4.x to LR 5.x is a pay-for upgrade.
Alternatively you can use the DNG Converter 8.2 or newer to convert the G16 raw files to DNG raw files and those will work in your older LR 4 version.
Adobe updates whatever the current version is with new cameras, so once LR 5 came out LR 4.x ceased to be updated for new cameras.