Edit all products at the same time, you can edit prices, categories, metas, description, tags, taxes... and much more, very useful module for saving time. I have installed in a Warehouse 4.2.1 with PS V. 1.7.5.0 and works good
https://addons.prestashop.com/en/fast-mass-updates/19965-bulk-mass-editing-products.html
- Products and combination of the products
 
- Final / base / wholesale price: you can increase/decrease by percentage / value or  replace by another price.
 
- Set tax rule
 
- Increase / decrease the quantity of product or replace it with another value.
 
- Setting minimal products quantity to buy
 
- Setting the text when the product is in stock
 
- Setting the ordering when the product is out stock
 
- Change category / default category (add categories to the current or set other, removal of certain categories)
 
- Change manufacturer and supplier
 
- Add / edit discount to products or combinations
 
- Add accessories to the products
 
- Turn off or turn on product.
 
- Add features / specifications for products
 
- Change Visibility / Condition / Options product / Display «On sale»
 
- Change delivery / weight and size
 
- Set impact on weight
 
- Add image to product or combinations.
 
- Setting the legends and their generation (category, manufacturer, product name) for images
 
- Add short / long description (multiple languages)
 
- Generating short / long description by properties, manufacturer, final price, product name, reference, category
 
- Add delivery method
 
- Setting the reference of supplier
 
- Setting the reference, EAN-13, UPC for products and combinations
 
- Remove combination with selected attributes
 
- Remove attributes from combinations
 
- Add attributes incomplete combinations
 
- Change / edit attachments
 
- Change / edit meta tags (title, keywords, description, tags, meta generator by properties, manufacturer, final price, product name, reference, category), remove meta tags
 
- Change friendly url  (generator by manufacturer, final price, product name, reference, category)
 
- Create custom fields
 
- Create new products
 
The module supports advanced stock management and multi-shop
Powerful filter by products:
- the name (exact match / occurrence)
 
- id (exact match / occurrence)
 
- EAN-13, barcode (exact match / occurrence)
 
- description (exact match / occurrence)
 
- short description (exact match / occurrence)
 
- category and default category
 
- manufacturer
 
- supplier
 
- carrier
 
- image
 
- presence of discounts
 
- activity
 
- quantity
 
- price
 
- feature
 
- date created