How do I get rid of Aimersoft Helper Compact on my Mac?

How do I get rid of Aimersoft Helper Compact on my iMac?

Though the performance of my Mac does not seem to be hindered, I do get a pesky pop-up saying that "70 issues have been found". Same message for about a 6 months now...pops up about an hour after I'm on, then about every 2 hours thereafter. Here is a screenshot of the pop-up:

I am not aware of downloading or accepting anything from Aimersoft. However, I have noticed Aimersoft in my Login items list, repeated many times in a row. The kind of item is listed as "unknown". I've tried doing a search on my computer to find where it's hidden, but no luck, except for the Login items list as mentioned above.

I thought the problem would go away when I updated to version OS 10.13.5 in June, but it had no effect on eliminating the recurrence of the pop-up.

My Mac info:

OS High Sierra 10.13.5

iMac (21.5-inch, Mid 2011)

Processor 2.5 GHz Intel Core i5

Memory 8 GB 1333 MHz DDR3

Thanks for your help.