How specifically can I restore the earlier version of Safari?
I operate a MacBook Air, mid 2011with Mac OS High Sierra 10.13.6 and have updated every time a new update comes out. Safari 12 was just released and I updated Safari. Post update, I was unable to access our business system and saw an unsupported plugin message every time I was trying to access the Oracle program we use. Doing some reading, I update Java with no change in results. I am a one person company who was put out of business with this update and the only solutions appear to be 1. restore to an earlier Safari version or 2. download Parallel and a windows license to access the factory program.
Which solution is best and how is it done? Thank you in advance for any assistance.
VIN,MacBook Air (11-inch Mid 2011)