Upgrade Advice v1.5.7 - Upgrade Service Wanted?

[sports guy]

I have a client with tons of products and she is currently using ZC 1.5.5f. with php v5.4. Yes I want to upgrade soon but am at a cross-roads. Reason being: Am thinking of moving to Prestashop, only because she has dealer pricing, and it looks like Dual Pricing is not longer being developed: https://www.zen-cart.com/downloads.php?do=file&id=74

I also have a few other plugins to consider as well:
Dual Pricing
USPS
Keepalive Timer
Attribute Image Swatch v1.1.8
Ultimate SEO Urls
CK Editor

Her dealer pricing just stopped working and she is now in a panic. So before I head over to Commercial Help Wanted to find a developer to help me upgrade, is this this feasible to upgrade easily with Dual Pricing looking like its not working? If not and I have to rebuild from scratch (which I really don't want to do) she might move to Prestashop only because dealer pricing is built in. I do want to stay with Zen Cart, it would be so much easier and cheaper, if we can get this updated and working again. Any advice?

If you are a developer and interested in upgrading for me and think you can help me with this, you can PM me with upgrade pricing.

[balihr]

Dual Pricing is working, just not the one from Plugins section. You need to use the one from github - I've just used it on a 1.5.7b, and added a minor patch to get it working.

[DrByte]

Her dealer pricing just stopped working and she is now in a panic

Can you be any more vague about the problem?

Before looking at upgrades etc, have you figured out what exactly caused the "just stopped working"?

If you don't know the underlying reason, your efforts at an upgrade might still not actually fix that problem.

Is the problem from ...
- database corruption?
- user-error?
- server software upgrades like PHP version? MySQL version?
- something tampered with?

In short: WHAT exactly does "just stopped working" mean? (Also, does it affect just one product, or one customer? Do errors show on screen, or get logged to the logs dir?) Probably good to discuss that in the plugin's support thread.